“…Six articles had better comparability among participants by controlling for the selection bias (Getchell and Whitall, 2003;Hagmann-von Arx et al, 2016;Otte and van Mier, 2006;Reilly et al, 2008;Schaefer et al, 2015;Spronk and Jonkman, 2012). As per criteria proposed in Table 1, very few studies addressed most of the methodological issues (Anderson et al, 2011;Hinton and Vallis, 2015;Reilly et al, 2008;Schaefer et al, 2008). Table 2 outlines these methodological criteria for each study.…”