“…Finally, a total of 18 articles(Agrawal et al, 2019;Aye et al, 2018;Çekmez et al, 2014;Cetinkaya et al, 2015;Cizmeci et al, 2015;Dhandai et al, 2018;Dinlen et al, 2016;El-Kader et al, 2018;Gad et al, 2015;Gamal et al, 2017;Kumar et al, 2019;Mokhtar et al, 2018;Ozdemir & Cag, 2019;Sarwade, 2019;Say et al, 2017;Tayel et al, 2018;Uday et al, 2016;Yang et al, 2016) were included in this systematic review and meta-analysis (Table1and Figure1).3.2 | Characteristics of the original studiesIn the current study, 12 case-control(Agrawal et al, 2019;Aye et al, 2018;Çekmez et al, 2014;Cizmeci et al, 2015;Dinlen et al, 2016;Gad et al, 2015;Gamal et al, 2017;Mokhtar et al, 2018;Sarwade, 2019;Say et al, 2017;Tayel et al, 2018;Yang et al, 2016) and six cohort(Cetinkaya et al, 2015;Dhandai et al, 2018;El- Kader et al, 2018;Kumar et al, 2019;Ozdemir & Cag, 2019;Uday et al, 2016) studies were included. Out of the included studies, six were from Turkey(Çekmez et al, 2014;Cetinkaya et al, 2015;Cizmeci et al, 2015;…”