RT Journal Article SR Electronic T1 CMA urges prescription-only antibiotics for agricultural use JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP E1007 OP E1008 DO 10.1503/cmaj.109-3989 VO 183 IS 13 A1 Vogel, Lauren YR 2011 UL http://www.cmaj.ca/content/183/13/E1007.abstract