aDepartment of Public Health, Brown University, Providence, US bDepartment of Economics, Brown University, Providence, US cDepartment of Anesthesiology, Chi Mei Medical Center, Tainan, Taiwan dDepartment of Hospital and Health Care Administration, College of Recreation and Health Management, Chia Nan University of Pharmacy and Science, Tainan, Taiwan eDepartment of General Surgery, E-Da Cancer Hospital, I-Shou University, Kaohsiung, Taiwan fSchool of Medicine, College of Medicine, I-Shou University, Kaohsiung, Taiwan gDepartment of Medical Education and Research, E-Da Cancer Hospital, I-Shou University, Kaohsiung, Taiwan Sponsorships or competing interests that may be relevant to content are disclosed at the end of this article. Published online ■ ■ *Corresponding author. Address: E-Da Cancer Hospital, I-Shou University, Kaohsiung, Taiwan. TAIWAN. E-mail address: [email protected] (C.C. Chiu) This is an open access article distributed under the Creative Commons Attribution License 4.0 (CCBY), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. http://creativecommons.org/licenses/by/4.0/