RT Journal Article SR Electronic T1 Grapefruit juice and clopidogrel JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 1066 OP 1066 DO 10.1503/cmaj.113-2126 VO 185 IS 12 A1 Friesen, Mark H. YR 2013 UL http://www.cmaj.ca/content/185/12/1066.1.abstract AB