RT Journal Article SR Electronic T1 MediData: How many types of medical marijuana are for sale? JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP E475 OP E475 DO 10.1503/cmaj.109-4847 VO 186 IS 13 A1 Roger Collier YR 2014 UL http://www.cmaj.ca/content/186/13/E475.abstract AB