“…Based on our search strategy, the primary screening produced 21 potentially relevant articles, of which 15 met the inclusion criteria as an attempt to evaluate the association between the ACE I/D polymorphism and occurrence of OSAHS (Xiao et al, 1999;Zhang et al, 2000;Barcelo et al, 2001;Ping et al, 2001;Li et al, 2004a,b;Lin et al, 2004;Zhang et al, 2004;Gu et al, 2006;Li et al, 2006;Bostrom et al, 2007;Benjamin et al, 2008;Koyama et al, 2009;Ogus et al, 2010;Yakut et al, 2010). A total of 1361 OSAHS patients and 1373 controls were analyzed.…”