“…Five studies had a low RoB in all evaluated domains (Miranzadeh et al, 2015;Baharvand et al, 2010;Baharvand et al, 2015;Sarvizadeh et al, 2015;Cabrera-Jaime et al, 2018) and could be considered more reliable studies (Figure 2). "Unclear risk," defined as insufficient or missing data that difficult the assessment of the original study, occurred in the "random sequence generation" and "allocation concealment" domains of 11 (Dodd et al, 2003;Yen et al, 2012;Cerchietti et al, 2003;Sprinzl et al, 2001;Erden and Ipekcoban, 2017;Lin et al, 2015;Porta et al, 1994;Erdem et al, 2014;Limaye et al, 2013;Rothwell and Spektor, 1990;Wadleigh et al, 1992) and 12 studies (Yen et al, 2012;Cerchietti et al, 2003;Anderson et al, 1989;Sprinzl et al, 2001;Erden and Ipekcoban, 2017;Porta et al, 1994;Satheeshkumar et al, 2010;Vayne-Bossert et al, 2010;Erdem and Güngörmüş, 2014;Wadleigh et al, 1992;Hejna et al, 2001;Mansouri et al, 2012), respectively. "High risk" in the "blinding of participants and personnel" domain occurred in six studies (Cerchietti et al, 2003;Sprinzl et al, 2001;Lin et al, 2015;Satheeshkumar et al, 2010;Limaye et al, 2013;Hejna et al, 2001).…”