Prescription opioid treatment for non-cancer pain and initiation of injection drug use: large retrospective cohort study

Wilton J, Abdia Y, Chong M, Karim ME, Wong S, MacInnes A, Balshaw R, Zhao B, Gomes T, Yu A, Alvarez M, Dart RC, Krajden M, Buxton JA, Janjua NZ, Purssell R