RT Journal Article SR Electronic T1 Legal ambiguities surround authority to make end-of-life decisions JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP E617 OP E618 DO 10.1503/cmaj.109-3910 VO 183 IS 10 A1 Vogel, Lauren YR 2011 UL http://www.cmaj.ca/content/183/10/E617.abstract