Mocanu V, Bozinoff N, Wood E, Jutras-Aswad D, Le Foll B, Lim R, Choi JC, Mok WY, Socías ME; OPTIMA Research Group within the Canadian Research Initiative in Substance Misuse Opioid agonist therapy switching among individuals with prescription-type opioid use disorder: secondary analysis of a pragmatic randomized trial Drug Alcohol Depend PubMed