Colorimetric and fluorometric Seleno-BODIPY sensor for selective palladium detection in solution and on a cotton swab platform

PurposeTo evaluate the safety and efficacy of yellow laser photocoagulation for deep conjunctival nevi.MethodologyThis prospective interventional case series included patients with clinically stable conjunctival nevi for ≥6 months. Treatment was performed using the Iridex yellow laser (577 nm) under topical anesthesia, with a 200-micron spot, 80 ms exposure, and 300-600 mW power. The lesion was removed with sterile cotton buds post-laser, and topical steroids were prescribed for one week. Follow-up was at day 1, week 1, month 1, and month 3, assessing ocular surface health and lesion resolution. Examinations included Schirmer Test 1, Oxford corneal staining, Ocular Surface Disease Index (OSDI), tear meniscus height, and non-invasive keratograph break-up time (NIKBUT).ResultsThe study included 10 eyes from 9 patients. Mean age was 30 years (range: 6-63), with a 1:1 sex ratio. Anterior segment OCT confirmed subepithelial lesions in all, with intralesional cysts in 60%. Mean nevus diameter was 4.2 mm (range: 2-11), and 70% showed severe pigmentation. Laser treatment was completed in one session for 90% of eyes; one required a second due to large size. No significant changes were observed in ocular surface parameters. At a mean follow-up of 10.5 months (range: 3-17), 85% (6/7) of eyes had complete resolution when the laser was fully applied. No recurrence occurred. One patient developed conjunctival scarring from inadvertent Tenon's capsule application.ConclusionYellow laser photocoagulation is a safe, effective, minimally invasive outpatient treatment for conjunctival nevi, including deeply pigmented cases. It yields excellent cosmetic outcomes with minimal side effects, supporting its role as a potential standard of care.

In contemporary society, heavy metal ions have posed significant threats to water systems and human health, for which timely and accurate detection is of much significance. In this work, a new metal-organic framework, CUST-1022, [Cd(H2BPDC)(phen)]CH3OH was synthesized via the solvothermal method. Due to the existence of uncoordinated carboxyl sites in CUST-1022, Eu3+ was introduced into CUST-1022 through the postsynthesis modification method to construct a ratiometric fluorescence sensing material, Eu3+@CUST-1022. Eu3+@CUST-1022 demonstrates exceptional performance in detecting Fe3+, CrO42-, and Cr2O72-, with detection limits of 8.63 μM, 1.26 μM, and 1.91 μM, respectively, which represent a significant improvement (lower detection limits) over pristine CUST-1022 (15.72 μM for Fe3+, 5.46 μM for CrO42-, and 2.86 μM for Cr2O72-). Moreover, the sensing process was accompanied by a distinct color change, enabling visual discrimination. A portable fluorescent sensor was fabricated by using cotton swabs, offering a novel strategy for the direct detection of heavy metal ions in aqueous solutions. The potential fluorescence quenching mechanism was found to be energy competition absorption and dynamic quenching. The ratio-type fluorescent sensor prepared by the postsynthesis modification method reduces the detection limit, which represents an effective strategy for constructing MOF-based sensors for ion detection in practical environmental applications.

Canal Cholesteatoma Presentation and Management: A Systematic Review and Meta-Analysis.

A dual-channel smart fluorescent probe for rapid on-site detection of thiophenol and hydrazine in biological, environmental, and food samples.

Turn-Off Fluorescence Chemosensor Based on Rhodamine B-tethered-Schiff base for Fe (III) ions and its applications in Paper Test Strips and Cotton Buds

Evaluating and reducing environmental waste in oculofacial plastic procedures.

Disinfectants are chemicals capable of destroying or inhibiting the growth of microorganisms on inanimate surfaces. Disinfecting toilet floors is a fundamental aspect of infection control in schools and communities. This study aimed to evaluate the effectiveness of three disinfectants against bacteria isolated from toilet floors at the College of Natural and Pharmaceutical Sciences, Bayero University, Kano. Swabs were collected using sterile cotton swabs after treatment with disinfectants. Bacterial isolates were identified through standard microbiological methods, with biochemical tests used to confirm their presence. The effectiveness of three disinfectants, Chloroxylenol, isopropyl alcohol (X), Sodium hypochlorite (Y), and 32% Phenol (Z), was tested against the isolated bacteria. Three concentrations (100%, 75%, and 50%) of each disinfectant were tested on all organisms using the agar well diffusion method. The minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) of each disinfectant were determined. The organisms were also tested against some standard antibiotics. The novelty of this study lies in isolating five environmentally important bacterial species directly from toilet floor surfaces. These include Staphylococcus aureus, Escherichia coli, Klebsiella sp, Bacillus sp and Pseudomonas sp. The ability of these organisms to survive and grow at graded concentrations (100%, 75%, and 50%) provides new insight into their differential tolerance and potential reduced susceptibility under real-world sanitation conditions. The results showed that X was the most active among the tested disinfectants. Bacillus sp resist all three disinfectants tested, while S. aureus is the most susceptible organism. At 50% and 25% Y and Z failed to kill the organisms. The susceptibility pattern showed that S. aureus, E. coli, and Pseudomonas sp. were more susceptible to Y at rates of 73%, 64%, and 57%, respectively. At 100% concentration, all organisms exhibit the highest zones of inhibition, 25-32mm. At 50% concentration, all isolates exhibited visible growth, indicating significant loss of disinfectant efficacy at sub-optimal concentrations. MICs of all disinfectants against all isolates ranged from 6.25 µg to 12.5 µg, except for Klebsiella sp. and Bacillus spp., which exhibited 12.5 µg. The study demonstrated that all disinfectants were active against the tested organisms, with the highest activity observed for Y. Regular surface disinfection is essential to reduce infectious diseases caused by contact with environmental pathogens.

Not susceptible to methicillin Staphylococcus aureus (MRSA), is a potentially harmful bacteria that is resistant to the most important antimicrobial agents. Because MRSA is so resistant to many antibiotics, it can cause illnesses by forming biofilms. The aim of this study was to assess the nasal carriage rate of biofilm-producing methicillin-resistant Staphylococcus aureus (MRSA) and its associated factors among HealthCare Workers at Wachemo University Nigist Ellen Mohammed Memorial Comprehensive Specialized Hospital, Central Ethiopia. This cross-sectional study, carried out at Wachemo University Nigist Ellen Mohammed Memorial Comprehensive Specialized Hospital, Central Ethiopia from August 1 to November 30, 2023. Nasal swab samples from 294 healthcare workers (HCWs) were obtained using sterile cotton swabs. Bacterial isolates were identified using standard culture methods on Mannitol Salt and Blood Agar, while antimicrobial susceptibility testing and biofilm formation assessments followed the CLSI 2023 (M100, 33rd edition) guidelines via the Kirby-Bauer disk diffusion methods. All laboratory analyses were performed in triplicate to ensure consistency. Data were double-entered into Epi Data version 4.6 and cross-checked for accuracy. Missing or inconsistent data were verified against original laboratory records and latterly then, exported to SPSS V25 for analysis. Descriptive statistics and logistic regression were applied for statistical evaluation, with a p-value of ≤ 0.05 regarded as statistically significant. In this study, the occurrence rates of S. aureus, MRSA, and biofilm-producing MRSA were 98 out of 294 isolated strains (33.4%), 41 out of 294 isolated strains (13.9%), and 28 out of 294 isolated strains (9.5%), respectively. The MRSA strains exhibited high sensitivity to linezolid, rifampicin, and vancomycin while showing resistance to cefoxitin, cotrimoxazole, and ciprofloxacin. A history of prior hospitalization (length of stay in the hospital) was statistically significant for the colonization of biofilm-producing MRSA, with an adjusted odds ratio of 10.00 (95% CI: 1.36-73.3; P = 0.024). MRSA and MRSA that produces biofilms were found to be 41.8% and 68.3% prevalent overall in the study area, respectively. Biofilm-producing MRSA is a potential cause of healthcare-associated diseases. Therefore, these findings emphasize the urgent need for improved infection-prevention practices and routine screening of healthcare workers to mitigate the risk of healthcare-associated infections.

Cerumen (earwax) is a normal secretion of the serous and sebaceous glands of the outer third of the external ear canal, consisting of glycopeptides, lipids, hyaluronic acid, sialic acid, lysosomal enzymes, and immunoglobulins. When cerumen builds up and blocks the ear, it is referred to as cerumen impaction. Factors that increase the occurrence of cerumen impaction are narrow and tortuous ear canals, the use of cotton buds to clean the ears, the use of earplugs, or other defects. The research method used was observation, combined with questionnaire data collection and ear examination using an otoscope, which was then analyzed both descriptively and analytically. Analysis through the IBM SPSS version 23 using the chi-square statistical test obtained significant results on the relationship between ear cleaning behavior and the incidence of cerumen impaction (P = 0.009; P <0.05), and there is a significant relationship between the use of earplugs and the incidence of cerumen impaction (P = 0.002; P <0.05) in factory workers at PT Wijaya Karya Beton Pasuruan.

Summary: In Hualien, Taiwan, the mountainous terrain covers 90% of the area, and medical resources are concentrated in urban centers, which makes emergency response in disaster situations challenging. Natural disasters occur frequently, and Hualien County urgently needs to establish and develop a disaster medical rescue team. In 2018, the Hualien County Health Bureau formed a disaster medical team to address local needs. However, accurately estimating logistical supply requirements remains a significant challenge, as insufficient supplies may delay response, while overstocking leads to resource waste. To improve the accuracy of advanced preparation of logistical supplies, Hualien’s major disaster data in the past ten years were reviewed. A major disaster is an incident involving more than 30 injured people. The two most significant incidents were the 2018 earthquake (293 injuries) and the 2021 train accident (220 injuries), of which over 90% were trauma victims. Based on these data, supply and demand are estimated using the Historical Data Projection method adapted to local conditions. Emergency nurse practitioners experienced in responding to these disasters completed a questionnaire about supply types and quantities. Through this analysis, the four most in-demand supplies were identified: 4x4 gauze pads (221 packs), cotton swabs (222 packs), 4-inch elastic bandages (43 packs), and 6-inch elastic bandages (28 packs). This study demonstrates that the high demand for gauze and swabs underscores the critical need for wound cleaning and dressing in trauma-heavy scenarios. Literature suggests that precise pre-arrangement of logistical supplies reduces resource waste and improves cost-effectiveness. The Historical Data Projection aligns with Hualien’s needs, providing reliable guidelines for resource allocation. Ongoing data collection and AI integration will further enhance the accuracy of supply forecasting, ensuring efficient disaster response.

A simple ratiometric fluorogenic and chromogenic chemodosimeter for hydrazine detection in pure aqueous solution: Applications in food and soil samples, along with smartphone-based sensing systems.

Background: Urban noise is a neglected determinant of aural morbidity, especially in low-income settlements where housing density and poor hygiene amplify exposure risks. Bhubaneswar, a rapidly urbanising city in eastern India, offers a unique setting to examine the interplay between environmental noise, aural hygiene practices, and habitat conditions. Objectives: To assess the relationship between noise exposure levels, aural hygiene behaviors, and residential characteristics with ear health status among adolescents and adults residing in urban slums of Bhubaneswar city, Odisha Methods: A community-based, observational descriptive study was conducted among 384 participants aged 10–50 years, selected by stratified random sampling from six slums representing low, medium, and high noise zones. Data on socio-demographic variables, environmental factors, and hygiene practices were collected using a pre-tested semi-structured questionnaire. Otoscopic and tuning-fork examinations assessed ear morbidity. Data were analysed in SPSS v25 using Chi-square tests and multivariate logistic regression at a 95 % confidence level. Results: Overall prevalence of aural morbidity was 21 %—11 % infections, 3 % hearing loss, and 7 % combined morbidity. The prevalence of deafness increased from 2 % in low-noise, 11 % in medium-noise, to 16 % in high-noise zones (p = 0.001). Use of sharp or metallic objects for ear cleaning (p = 0.017), poor household ventilation (p = 0.016), and shared bathing facilities (p = 0.002) were significantly associated with ear disease. Participants in high-noise areas had 8.5 times higher odds of combined infection and hearing loss (95 % CI 2.9–25.1). Lower socio-economic caste category also increased risk (OR 4.1; 95 % CI 1.14–14.9). Conclusion: Exposure to sustained urban noise, coupled with unsafe aural hygiene and poor housing, significantly impairs ear health among slum residents. Integrating environmental noise control, community awareness, and periodic aural screening within primary health-care services is crucial to reducing preventable hearing morbidity.

Otitis media is an infection of the middle ear, characterized by inflammation of the mucosal lining, affecting individuals of all ages and genders. If left untreated, it can lead to significant consequences, including economic loss, impaired speech development, hearing impairment, and potentially permanent hearing loss. Consequently, otitis media constitutes a major public health concern. This study aims to investigate the prevalence, bacterial isolates, and antibiotic susceptibility profile of patients with otitis media, as well as examine the socio-economic characteristics of affected individuals in Okpoko, a rural community in Anambra State, Nigeria. A hospital-based cross-sectional study is being conducted from July 2024 to May 2025. Ear secretions are collected from patients presenting with middle ear discharge at the Ear, Nose, and Throat (ENT) clinic of Solution General Hospital, Okpoko, Ogbaru Local Government Area, Anambra State, using a sterile cotton swab. Patients suspected of otitis media presenting with middle ear discharge that consented were enrolled for the study. Their socio-demographic data were also obtained using a well-structured questionnaire. Samples were collected, cultured and identified using morphological appearance gram reaction and biochemical test. Disc diffusion method was used for tthe antibiotics susceptibility testing. Of the300 (male 155, female 145) ear swabs collected from patients with otitis media, 166(55.33%) yielded bacterial growth. Male patients had highest prevalence of 88(29.33%) than female 78(26.0%).Prevalence of bacterial etiologic agents associated with otitis media revealed Staphylococcus aureus 64 (38.55%) as the predominant isolate followed by Pseudomonas aeruginosa 46(27.71%). Levofloxacin is the most sensitive antibiotic while most were resistant to augmentin. However, most of the isolated bacteria were multiple drug resistance. It is therefore important that culture and sensitivity testing of ear swabs is done before institution of antibiotics to further reduce emerging pattern of antibiotics resistance.

To evaluate the diagnostic sensitivity of real-time PCR to detect Coccidioides spp DNA from oropharyngeal, nasal cavity, and conjunctival swab samples in dogs with pulmonary coccidioidomycosis. This was a prospective cohort study of client-owned dogs with newly diagnosed pulmonary coccidioidomycosis from January 2024 to October 2024. Sterile cotton swabs were gently rubbed within the nasal cavity and against the mucosa of the oropharynx and conjunctiva during the initial investigation for respiratory tract signs. Swabs were tested for Coccidioides spp, Blastomyces spp, Histoplasma spp, Pneumocystis jirovecii, and Pneumocystis canis DNA by multiplex quantitative PCR. Antibody serology assays (ie, agar gel immunodiffusion and enzyme immunoassay) were performed at a single reference diagnostic laboratory. 24 dogs were included. Seventy-two PCR tests (nasal cavity, n = 24; oropharyngeal, 24; and conjunctival, 24) were performed, and none of the tests positively detected Coccidioides spp DNA. Forty-six percent (11 of 24) and 71% (17 of 24) of dogs had positive detection of anti-Coccidioides spp immunoglobulin M and G antibodies with agar gel immunodiffusion, respectively. Seventy-nine percent (19 of 24) of dogs had positive detection of immunoglobulin G antibodies with enzyme immunoassay. Respiratory tract signs improved (50%; n = 12) or completely resolved (42%; 10) after approximately 3 months of PO fluconazole administration. Coccidioides spp DNA was not detected in any swab sample from the upper respiratory tract. Quantitative PCR to detect Coccidioides spp DNA from the nasal cavity, oropharynx, and conjunctiva using sterile cotton swabs provides no added diagnostic value in dogs with pulmonary coccidioidomycosis.

Neonates at a risk of hospital-acquired ESKAPEE infection despite implementation of infection prevention protocols

The pervasive use of currency notes in daily transactions makes them a potential vector for microbial contamination. This issue is particularly pertinent in developing countries like Nigeria, where sanitation practices may be less stringent, and public awareness of microbial risks is often limited. This is important in light of recent outbreaks such as COVID-19. Despite this there remains a notable lack of comprehensive studies specifically addressing the extent and types of microbial contamination present on Nigerian currency. This study investigates the microbial and parasitic contamination of Nigerian currency notes, highlighting the potential health risks associated with handling money. A total of 70 currency samples were analysed, revealing presence of various protozoan parasites and bacterial pathogens. Samples for bacterial culture were prepared by swabbing currency notes with sterile saline moistened cotton swabs. Bacteria were cultured on Salmonella Shigella media, incubated, and analysed for colony characteristics. Remaining samples underwent microscopic examination for protozoan parasites after centrifugation and resuspension. Among the protozoa, Entamoeba coli was the most prevalent, found in 35.7% of samples, followed by Enterobius vermicularis (57.1%) and Entamoeba histolytica (7.1%). Notably, no significant correlation was observed between the prevalence of these parasites (P = 0.38). Bacterial contamination was also assessed, with Klebsiella spp. detected in 50% of samples, while Escherichia coli and Proteus spp. were each found in 25% of the samples. Again, no significant association was noted among the bacterial contaminants (P = 0.377). The study further differentiated between polymer and paper notes, revealing that polymer notes (10 to 50 naira) were free from contamination, while paper notes exhibited varying contamination rates, with 100-naira notes showing 35.7% contamination. Mutilated notes had highest contamination level at 22.97±4.51%, compared to clean and dirty notes. Overall, the findings underscore the necessity for improved hygiene practices regarding currency handling to mitigate potential health risks.

Forensic DNA analysis, used for the purposes of species, sex, individual, and, geographic determination of wildlife is one of the most applied forensic techniques in, wildlife crime investigations. However, in most other criminal investigations forensic, DNA analysis refers to human DNA profiling for the purposes of identifying victims, and/or perpetrators. The ability to recover human DNA profiles from the surfaces of, wildlife specimens, such as ivory or fur, opens up opportunities for identification of, individuals involved in wildlife crimes in the absence of other evidence types. This, study aimed to compare the effectiveness of four different human touch DNA recovery, methods, cotton swabs, flocked swabs, foam swabs, and minitapes, from the surfaces, of a range of wildlife derivatives. Groups of four participants handled ivory, elephant, skin, snake skin, conch shell, antler, and antelope fur. DNA was subsequently, collected extracted, quantified, and profiled. Foam swabs, a non-traditional method of, touch DNA recovery, recovered the highest average DNA concentrations and number, of alleles across all specimen types acting as an effective cross-substrate recovery, method. Flocked swabs performed as the second-best recovery method for all, specimens except when sampling from antelope fur. Minitapes and cotton swabs, showed comparatively poor performance during this study despite being the two most,common DNA recovery techniques currently employed by law enforcement. Ivory, yielded the highest average human DNA concentrations but paradoxically produced a, significantly lower number of donor alleles. Our results indicate fresh touch DNA, deposits are recoverable from multiple wildlife specimens and recommend that, attempted recovery of touch DNA should be a routine consideration by forensic, practitioners during wildlife crime investigations.

Tinea capitis (TC) is a fungal scalp infection. In 2024, a sudden increase in TC cases caused by Trichophyton (T.) tonsurans was observed among young men in Copenhagen, Denmark. Most of the affected individuals had recently received haircuts with electric hair clippers at hair salons prior to symptom onset. We hypothesized that electric hair clippers could be a source of infection spread. The study objective was to investigate whether anthropophilic dermatophytes could be found in electric hair clippers from hair salons. Hair salons were randomly selected from municipalities in Copenhagen. Sampling was done by swabbing the head of the electric clippers and brushes with a sterile cotton swab moistened with sterile saline water. The swab was thereafter inoculated onto a Sabouraud dextrose agar plate supplemented with cycloheximide and chloramphenicol and incubated at 25-28°C for 4 weeks. Plates with fungal growth were submitted for species identification based on macro- and micromorphological characteristics and molecular diagnostics. 133 samples were collected from 57 hair salons, of which 122 were from electric clippers and 11 from cleaning brushes. After 4 weeks of incubation, eight out of the 133 samples from five salons were confirmed positive for T. tonsurans. Of these, five originated from clippers and three from brushes. The recent outbreak of T. tonsurans in Denmark is most likely attributable to transmission via electric hair clippers and indirectly through cleaning brushes, as T. tonsurans was isolated from 3/11 (27%) brush samples and 5/122 (4%) hair clipper samples collected from 5/57 (9%) hair salons in Copenhagen. These findings highlight the importance of thorough disinfection of hairdressing tools between each customer to prevent the transmission of fungi.

Genital warts (condyloma acuminatum) are a common sexually transmitted disease, usually caused by low-risk human papillomavirus (LR-HPV) types 6 and 11, which together account for more than 90% of all cases [1]. However, high-risk HPV (HR-HPV), particularly HPV 16, is occasionally detected and associated with penile and cervical cancer [2, 3]. In men, diagnosis typically relies on visual inspection, and confirmation requires biopsy, which imposes an invasive burden. Noninvasive diagnostic methods may help improve patient management and reduce barriers to clinical and epidemiological investigations [1]. We investigated HPV genotypes in male genital warts using a simple swab-based PCR test. Forty-nine Japanese men with suspected genital warts presenting at a community urology clinic were included. Lesions were swabbed at least five times with a sterilized cotton swab by the same experienced urologist, and DNA was extracted using a commercially available kit (Gcube Co. Ltd., Kobe, Japan). Real-time PCR was performed to detect HPV 6, 11, and 16 (The Applied BiosystemsThermo Fisher, QuantStudio 5). HPV genotyping was successfully performed in 46 of 49 patients (93.9%), and the clinical and virological characteristics of these cases are summarized (Table 1). Among them, HPV 6 was found in 23 cases, HPV 11 in 13, and HPV 6 + 11 coinfection in 5. These low-risk types accounted for approximately 89% of positive results. Importantly, HPV 16 was identified in five patients (10.9%), including one mono-infection, three HPV 6 + 16 coinfections, and one triple infection (HPV 6 + 11 + 16). Three patients tested negative, including one seborrheic keratosis and two previously treated with cryotherapy. The detection rate of HPV 16 in our study (10.9%) is consistent with Yuan et al., who reported 13.7% among condyloma patients in Shandong Province, China [1]. Our findings confirm that HPV 16 is frequently codetected with LR-HPV in genital warts, suggesting that clinicians should not regard all condyloma as low-risk disease. The presence of HR-HPV emphasizes the need for careful follow-up, especially considering its strong oncogenic association [3, 4]. Given that HPV 16 is implicated in over two-thirds of penile cancers and is the primary cause of cervical cancer, detection in male patients has important implications for both individual and partner management [4]. This study demonstrates the feasibility of noninvasive scraping combined with PCR for HPV genotyping in clinically diagnosed wart specimens, consistent with prior studies [1]. Traditionally, HPV typing in men has been limited, and biopsy-based sampling discourages routine testing. Invasive procedures for genital warts can be complicated by bleeding [5]. Our study shows that swab-based PCR is feasible, reliable, and suitable for use in outpatient clinics. This approach may help identify high-risk cases requiring closer monitoring, while also supporting public health strategies including male HPV vaccination. Although HPV vaccination programs in Japan have focused mainly on females [6], vaccination in males has likewise been investigated and demonstrated to be effective [7]. Our results highlight the potential benefit of expanding vaccination to men to reduce transmission and cancer risk. First, an internal control such as β-globin was not included to confirm the adequacy of human DNA in all samples; therefore, the true analytical sensitivity of HPV detection could not be fully validated. Second, another limitation of this preliminary study is its small sample size and the restriction to HPV types 6, 11, and 16. Other oncogenic types such as HPV 18, 31, and 45 were not investigated due to the limited detection range of the kit. Third, the persistence of HPV infection and recurrence after treatment were not assessed. Larger and more comprehensive studies are needed to establish the full clinical utility of noninvasive HPV testing in men. In summary, this study demonstrates the clinical feasibility of noninvasive scraping combined with PCR for HPV genotyping in Japanese men with genital warts. The observed distribution of HPV genotypes, including the presence of HPV 16 among successfully genotyped cases, highlights the importance of clinical awareness and supports further discussion regarding male HPV vaccination in Japan. Yu Yoshimura: writing – review and editing, writing – original draft. Mamoru Hashimoto: writing – review and editing. Takahisa Genji: validation. Kenji Nishimura: validation. Masahisa Ikegami: resources. Kazutoshi Fujita: supervision. Approval of the Research Protocol by an Institutional Review Board (IRB): Approved by the Ethics Committee of Kindai University (Approval No. R06-156). Written informed consent was waived due to the retrospective design. Kazutoshi Fujita, an Editorial Board member of the International Journal of Urology and a coauthor of this article, was not involved in any editorial decisions regarding the acceptance of this manuscript in order to minimize potential bias.