RT Journal Article SR Electronic T1 Brief interventions for substance use in adolescents: still promising, still unproven JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 565 OP 566 DO 10.1503/cmaj.140303 VO 186 IS 8 A1 Sharon Levy YR 2014 UL http://www.cmaj.ca/content/186/8/565.abstract AB