Abstract
In this section, we explain the statistical models and evaluation of heterogeneity among in meta-analysis, which appeared in the articles titled, A comparison of efficacy and safety of nonsteroidal anti-inflammatory drugs versus acetaminophen in the treatment of episodic tension-type headache: a meta-analysis of randomized placebo-controlled trial studies by Yoon et al.1) and Use of proton pump inhibitor and risk of colorectal cancer: a meta-analysis of observational studies by Ahn et al.2), both published in September 2012.
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