Table 4.

Primary studies included in meta-analyses

	Kanchanatawan et al.	Shen et al.	Xu et al.	Dai et al.
Cerza F 2012 [42]	+	+	+	+
Li M 2011 [43]	–	+	+	–
Patel et al. [27]	+	+	+	+
Sanchez et al. [28]	+	+	+	+
Vaquerizo V 2013 [44]	+	+	+	+
Filardo et al. [29]	+	+	+	+
Duymus TM 2016 [45]	–	+	+	+
Forogh B 2016 [46]	–	+	–	–
Gormeli G 2015 [47]	+	+	+	+
Raeissadat SA 2015 [48]	+	+	+	+
Smith PA 2016 [49]	–	+	+	+
Montanez-Heredia E 2014 [50]	–	+	–	–
Paterson KL 2016 [51]	–	+	–	+
Spakova T 2012 [52]	–	+	–	–
Filardo G 2012 [53]	+	–	–	–
Rayegani SM 2014 [54]	+	–	–	–