“…Because the dosage unit of contrast media can't be translated, that is to say, the absolute difference on dosage among these studies is unknown, 2 articles were rejected. 17 studies (Fobben et al, 1995;Stomper et al, 1995;Fenlon et al, 1997;Helbich et al, 1997;Fischer et al, 1999;Alamo et al, 2001;Kawashima et al, 2001;Goerres et al, 2003;Knopp et al, 2003;Pediconi et al, 2005;Sardanelli et al, 2005;Kneeshaw et al, 2006;Pediconi et al, 2007;Pediconi et al, 2008;Woodhams et al, 2010;Luciani et al, 2011;Martincich et al, 2011) with 1934 patients were included based on the inclusion criteria and the data integrity.…”