TY - JOUR T1 - Correction JF - Canadian Medical Association Journal JO - CMAJ SP - 929 LP - 929-c DO - 10.1503/cmaj.109-2053 VL - 181 IS - 12 A2 - , Y1 - 2009/12/08 UR - http://www.cmaj.ca/content/181/12/929.4.abstract ER -