Department of health science, University of Oslo, Oslo, Oslo 0317, Norway
Section of Nursing and Health Science, University of Oslo, Oslo, Norway
University of Oslo, Biologisk Stasjon Drøbak, Biologveien 2, Drøbak, Norway
Sykehuset ostfold Fredrikstad, Fredrikstad, Norway
1) Institute of General Practice and Community Medicine, University of Oslo, Oslo, Norway
Unit for Addiction Medicine, University of Oslo, Oslo, Norway
Ullevål University Hospital, Oslo, Norway
Distriktpsykiatrisk senter Helse sunnmøre, Ålesund, Norway