“…Of the total of 103 potentially relevant manuscripts identified, 65 studies were excluded after the examination of the abstracts and 38 studies were further evaluated by retrieving the full text. Finally, after the exclusion of 13 studies, 25 studies were included in the present systematic review and meta-analysis (Acien, 1993;Ban-Frangez et al, 2009;Ben-Rafael et al, 1991;Cooney et al, 1997;Erez et al, 2007;Heinonen, 1997;Hua et al, 2011;Jayaprakasan et al, 2011;Lavergne et al, 1996;Liang and Hu, 2010;Lin et al, 2009;Munoz Munoz et al, 2011;Pang et al, 2011;Ravasia et al, 1999;Saravelos et al, 2010;Shuiqing et al, 2002;Sorensen and Trauelsen, 1987;Sugiura-Ogasawara et al, 2010;Tomazevic et al, 2010;Tonguc et al, 2011;Valli et al, 2004;Woelfer et al, 2001;Zhang et al, 2010;Zlopasa et al, 2007;Zupi et al, 1996) (Figure 1). Characteristics of the studies included in the systematic review are presented in Table 1.…”