RT Journal Article SR Electronic T1 Standards of training JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 503 OP 503 DO 10.1503/cmaj.1060011 VO 174 IS 4 A1 Steve K. Singh A1 Stephen E. Fremes YR 2006 UL http://www.cmaj.ca/content/174/4/503.1.abstract