RT Journal Article SR Electronic T1 Pharma freebies for doctors linked to opioidprescribing habits JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP E202 OP E202 DO 10.1503/cmaj.109-5713 VO 191 IS 7 A1 Lauren Vogel YR 2019 UL http://www.cmaj.ca/content/191/7/E202.abstract