TY - JOUR T1 - Correction JF - Canadian Medical Association Journal JO - CMAJ SP - 174 LP - 174-a DO - 10.1503/cmaj.060782 VL - 175 IS - 2 A2 - , Y1 - 2006/07/18 UR - http://www.cmaj.ca/content/175/2/174.2.abstract ER -