“…Risks of bias fell into five major groups (selection bias, performance bias, detection bias, attrition bias, and reporting bias), and based on a study's scores in each of these groups it was labeled as having an overall high, low, or unclear risk of bias. Four were considered low risk of bias [21,31,39,45], two had a high risk of bias [29,41], and five had an unclear risk of bias [28,32,33,35,40]. The most common source of bias was performance bias due to the impossibility of blinding participants or personnel to certain treatments.…”