TY - JOUR T1 - Query JF - Canadian Medical Association Journal JO - CMAJ SP - 1992 LP - 1992 DO - 10.1503/cmaj.1040846 VL - 170 IS - 13 A2 - , Y1 - 2004/06/22 UR - http://www.cmaj.ca/content/170/13/1992.abstract ER -