TY - JOUR T1 - Correction JF - Canadian Medical Association Journal JO - CMAJ SP - 257 LP - 257-a DO - 10.1503/cmaj.080976 VL - 179 IS - 3 A2 - , Y1 - 2008/07/29 UR - http://www.cmaj.ca/content/179/3/257.2.abstract ER -