[1] Kaiser Permanente, Med Care Program, Div Res, Oakland, CA 94612 USA
[2] Univ Cape Town, Dept Psychol, ZA-7700 Rondebosch, South Africa
[3] Univ Calif San Francisco, Dept Psychiat, San Francisco, CA 94143 USA
[4] Univ Cape Town, Sch Publ Hlth & Family Med, ZA-7700 Rondebosch, South Africa
[5] Univ Cape Town, Div Child & Adolescent Psychiat, ZA-7700 Rondebosch, South Africa
[6] Univ Cape Town, Adolescent Hlth Res Inst, ZA-7700 Rondebosch, South Africa
[7] Univ Bergen, Res Ctr Hlth Promot, N-5020 Bergen, Norway