RT Journal Article SR Electronic T1 Canadian mnemonics for heart sounds JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 69 OP 69-a DO 10.1503/cmaj.1060180 VO 176 IS 1 A1 J. Wayne Warnica YR 2007 UL http://www.cmaj.ca/content/176/1/69.2.abstract