RT Journal Article SR Electronic T1 Advance directives: obstacles in preparing for the worst JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP E39 OP E40 DO 10.1503/cmaj.109-3743 VO 183 IS 1 A1 Lauren Vogel YR 2011 UL http://www.cmaj.ca/content/183/1/E39.abstract