“…Each item was marked: green-1: low risk; red-0: high risk and yellow-0: unclear risk of bias. A total of 9 points was the maximum that could be assigned (Table 2) (Milheiro et al, 1995; Yeung et al, 1996; Abou-Assi et al, 2002; Gürleyik et al, 2005; Muller et al, 2006; De Waele et al, 2007; Knoepfli et al, 2007; Uomo et al, 2007; Wu et al, 2008; Radenkovic et al, 2009; Lautz et al, 2011; Gompertz et al, 2012, 2013; Gonzalez-Gonzalez et al, 2012; Gomez Beltran et al, 2013; Gornik et al, 2013; Nijmeijer et al, 2013; Spanier et al, 2013; Albulushi et al, 2014; de-Madaria et al, 2014; Pant et al, 2014; Zuidema et al, 2014; Ho et al, 2015; Ocampo et al, 2015; Wang et al, 2015; Yue et al, 2015; Dombernowsky et al, 2016; Karpavicius et al, 2016; Mole et al, 2016; Parniczky et al, 2016; Rashidi and Røkke, 2016; Weitz et al, 2016; Zhang et al, 2016).…”