sentence: Both of these associations were stronger among folate-sufficient individuals.In addition to our previous cross-sectional study ( Gamble et al. 2005b ) , six other studies ( Chung et al. 2006 ; Hall et al. 2007 ; Heck et al. 2007 ; Li et al. 2008 ; Pilsner et al. 2009 ; Zablotska et al. 2008 ) have examined the role of cobalamin in relation to As metabolism or susceptibility to the health effects of As exposure .