RT Journal Article SR Electronic T1 Drug interactions with warfarin: what clinicians need to know JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 369 OP 371 DO 10.1503/cmaj.070946 VO 177 IS 4 A1 Juurlink, David N. YR 2007 UL http://www.cmaj.ca/content/177/4/369.abstract