TY - JOUR T1 - Correction JF - Canadian Medical Association Journal JO - CMAJ SP - 177 LP - 177-a DO - 10.1503/cmaj.070857 VL - 177 IS - 2 A2 - , Y1 - 2007/07/17 UR - http://www.cmaj.ca/content/177/2/177.2.abstract ER -