RT Journal Article SR Electronic T1 New medicinal marijuana rules ease onus on physicians JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 473 OP 473-a DO 10.1503/cmaj.050967 VO 173 IS 5 A1 Barbara Sibbald YR 2005 UL http://www.cmaj.ca/content/173/5/473.2.abstract