RT Journal Article SR Electronic T1 Prevalence of class I, II and III obesity in Canada JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 156 OP 157 DO 10.1503/cmaj.050806 VO 174 IS 2 A1 Katzmarzyk, Peter T. A1 Mason, Caitlin YR 2006 UL http://www.cmaj.ca/content/174/2/156.abstract