[1] Univ Oslo, Inst Clin Med, Fac Med, POB 1171, N-0318 Oslo, Norway
[2] Stellenbosch Univ Private, Dept Psychol, Alan J Flisher Ctr Publ Mental Hlth, Bag X1, ZA-7602 Matieland, South Africa
[3] SINTEF Technol & Soc, POB 124, N-0314 Oslo, Norway
[4] Innlandet Hosp Trust, Natl Ctr Dual Diag, Furnesvegen 26, N-2380 Brumunddal, Norway
[5] Hedmark Univ Coll, Fac Publ Hlth, POB 400, N-2418 Elverum, Norway
[6] Oslo Univ Hosp, Div Mental Hlth & Addict, Dept Res & Dev, Ulleval Kirkeveien 166,Bldg 20, N-0407 Oslo, Norway