TY - JOUR T1 - Correction JF - Canadian Medical Association Journal JO - CMAJ SP - 61 LP - 61-c DO - 10.1503/cmaj.091106 VL - 181 IS - 1-2 A2 - , Y1 - 2009/07/07 UR - http://www.cmaj.ca/content/181/1-2/61.4.abstract ER -