RT Journal Article SR Electronic T1 Canada behind in regulating farmyard antibiotics JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 173 OP 173 DO 10.1503/cmaj.109-4698 VO 186 IS 3 A1 Paul Christopher Webster YR 2014 UL http://www.cmaj.ca/content/186/3/173.abstract AB