RT Journal Article SR Electronic T1 Too heavy to save or be saved JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP E975 OP E976 DO 10.1503/cmaj.109-3957 VO 183 IS 13 A1 Yoni Freedhoff YR 2011 UL http://www.cmaj.ca/content/183/13/E975.abstract