TY - JOUR T1 - Correction JF - Canadian Medical Association Journal JO - CMAJ SP - 222 LP - 222 DO - 10.1503/cmaj.1041117 VL - 171 IS - 3 A2 - , Y1 - 2004/08/03 UR - http://www.cmaj.ca/content/171/3/222.abstract ER -