“…We identified 29 articles (Balasubbu et al, 2010;dos Santos et al, 2005;Gao et al, 2007;Globocnik Petrovic et al, 2003;Goulart et al, 2008;Hudson et al, 1998Hudson et al, , 2001Kankova et al, 1999Kankova et al, , 2001aKankova et al, ,b, 2002Kankova et al, , 2005Kumaramanickavel et al, 2002;Liu and Xiang, 2000;Lu et al, 2008;Matsunaga-Irie et al, 2004;Peng et al, 2009;Prasad et al, 2010;Ramprasad et al, 2007;Ren et al, 2003;Uthra et al, 2010;Xu et al, 2002Xu et al, , 2004Yang et al, 2003Yang et al, , 2008Yoshioka et al, 2005a,b;Zhang and Chen, 2008;Zhang et al, 2009)with 58 outcomes eligible for this meta-analysis, including 16 outcomes for T2DM, 6 outcomes for DR and 4 outcomes for DN considering Gly82Ser polymorphism; 6 outcomes for T2DM, 3 outcomes for DR and 4 outcomes for DN considering 1704 G/T polymorphism; 9 outcomes for T2DM, 5 outcomes for DR and 5 outcomes for DN considering 429 T/C polymorphism. All 29 articles were case-control designs.…”