The hospital outpatient alcohol project (HOAP): protocol for an individually randomized, parallel-group superiority trial of electronic alcohol screening and brief intervention versus screening alone for unhealthy alcohol use

- Johnson, Natalie A.; Kypri, Kypros; Saunders, John B.; Saitz, Richard; Attia, John; Dunlop, Adrian; Doran, Christopher; McElduff, Patrick; Wolfenden, Luke; McCambridge, Jim