“…33 studies (55.9%) mentioned ethical approval sought to perform the study: Ahmed, 2016; Alper, 2020; Altunkeser, 2019; Berkesoglu, 2021; Bouton, 2015; Cetin, 2019; Cetinkaya, 2020; Chen, 2021; Chirappapha, 2018; Cornejo-Juarez, 2014; Dalbasi, 2021; Davis, 2019; Erturk, 2021; Farouk, 2017; Fayed, 2019; Joseph, 2014; Kafadar, 2021; Karanlik, 2014; Kiyak, 2014; Maher, 2021; Oak, 2021; Pandey, 2014; Postolova, 2020; Sakurai, 2011; Shin, 2017; Shojaee, 2021; Tan, 2019; Tekgoz, 2020; Toktas, 2021; Wang, 2020; Yabanoglu, 2015; Zhang, 2019; Zhang Xiaohui, 2020. The Çaliş, et al, 2014 and Deng, et al, 2017 studies described no ethical approvals sought, but patients included in the studies had provided written consent ( 40 , 77 ). The remaining 24 studies (40.7%) did not mention any ethical approval: Akahane, 2013; Akcan, 2014; Aldaqal, 2004; Alrayes, 2019; Altintoprak, 2015; Atak, 2015; Atalay, 2011; Dag, 2021; Elzahaby, 2016; Erhan, 2000; Eser, 2013; Gunduz, 2014; Gurleyik, 2012; Hur, 2013; Kayahan, 2012; Kundaktepe, 2021; Lai, 2005; Liao, 2020; Mawla, 2020; Neel, 2013; Ocal, 2010; Sen Oran, 2013; Skandarajah, 2015; Wang, 2021.…”