[1] Tech Univ Dresden, Clin Psychol & Psychotherapy, Chemnitzer Str 46, D-01187 Dresden, Germany
[2] Chem & Vet Untersuchungsamt CVUA Karlsruhe, Weissenburger Str 3, D-76187 Karlsruhe, Germany
[3] Ctr Addict & Mental Hlth, 33 Russell St,ARF 2035, Toronto, ON M5S 2S1, Canada
[4] Univ Toronto UofT, Dalla Lana Sch Publ Hlth, Addict Policy, 155 Coll St, Toronto, ON M5T 3M7, Canada
[5] UofT, Fac Med, Dept Psychiat, 250 Coll St,8th Floor, Toronto, ON M5T 1R8, Canada
[6] UofT, Inst Med Sci, 1 Kings Coll Circle,Room 2374, Toronto, ON M5S IA8, Canada