“…The results of the risk of bias of the included studies are showed in Table 2. The randomisation process was rated low risk in eight studies because the randomisation was performed by sealed envelopes or coin toss or software random number table or block randomisation in the included studies (Aghbolagh et al, 2020; Babamohamadi et al, 2015; Burrai et al, 2019; Lin et al, 2012; Melo et al, 2018; Momennasab et al, 2018; Pothoulaki et al, 2008; Shabandokht‐Zarmi et al, 2017). This criterion was rated some concern in six studies due to no information about randomisation process (Babamohamadi et al, 2017; Burrai et al, 2014; Cantekin & Tan, 2013; Hou et al, 2017; Karadag & Karadakovan, 2015; Koca Kutlu & Eren, 2014).…”