title: Physicians as gatekeepers in the use of medical marijuana.
authors.forename: John W
authors.initials: JW
authors.lastname: Thompson
authors.forename: Mark A
authors.initials: MA
authors.lastname: Koenen
mesh_terms: D002188:Cannabis; D020793:Gatekeeping / Q000331:legislation & jurisprudence*; D006801:Humans; D010819:Physician's Role; D008517:Phytotherapy; D014481:United States