TY - JOUR T1 - Correction JF - Canadian Medical Association Journal JO - CMAJ SP - 377 LP - 377-a DO - 10.1503/cmaj.071001 VL - 177 IS - 4 A2 - , Y1 - 2007/08/14 UR - http://www.cmaj.ca/content/177/4/377.2.abstract ER -