TY - JOUR T1 - Correction JF - Canadian Medical Association Journal JO - CMAJ SP - 501 LP - 501-b DO - 10.1503/cmaj.109-2020 VL - 181 IS - 8 A2 - , Y1 - 2009/10/13 UR - http://www.cmaj.ca/content/181/8/501.3.abstract ER -