RT Journal Article SR Electronic T1 When you have eliminated the impossible … JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP E823 OP E823 DO 10.1503/cmaj.111452 VO 184 IS 15 A1 Marcin Chwistek YR 2012 UL http://www.cmaj.ca/content/184/15/E823.abstract