[1] Norwegian Inst Publ Hlth, Div Mental Hlth, N-0403 Oslo, Norway
[2] Norwegian Univ Sci & Technol, Res Ctr Hlth Promot & Resources HiST NTNU, Dept Social Work & Hlth Sci, N-7034 Trondheim, Norway
[3] Norwegian Med Assoc, Res Inst Tute, Oslo, Norway
[4] Univ Oslo, Inst Hlth & Soc, Dept Hlth Management & Hlth Econ, N-0316 Oslo, Norway
[5] Oslo Univ Hosp HF, Aker, Norway
[6] Univ Oslo, Inst Psychiat, N-0316 Oslo, Norway