International Journal of Preventive Medicine (Int J Prev Med)2008-78021182020092723252325ENSchool of Allied Medical Sciences, Kermanshah University of Medical Sciences, KermanshahSchool of Allied Medical Sciences, Kermanshah University of Medical Sciences, KermanshahDepartment of Infectious Diseases, School of Medicine, Kermanshah University of Medical Sciences, KermanshahDepartment of Oral and Maxillofacial Medicine, School of Dentistry, Kermanshah University of Medical Sciences, Kermanshah20200927<p>Dear Editor,</p><p>We have read very carefully the interesting review article in Int J Prev Med 2019. In fact, it seems that this review article, as many other studies published on the topic of systematic reviews and meta‑analyses, has not paid proper attention to the research methods and reporting.</p>http://ijpm.mui.ac.ir/index.php/ijpm/article/view/2325http://ijpm.mui.ac.ir/index.php/ijpm/article/download/2325/717718167