RT Journal Article SR Electronic T1 Ontario's hospitals surpass those of Quebec in C. difficile rates JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 1649 OP 1649 DO 10.1503/cmaj.080804 VO 178 IS 13 A1 Ann Silversides YR 2008 UL http://www.cmaj.ca/content/178/13/1649.abstract