1. Healthcare Services Research Unit (HØKH), Akershus University Hospital, Lorenskøg, Norway
2. Institute of Clinical Medicine, University of Oslo, Lorenskøg, Norway
3. Department of Medicine, Nordland Hospital Trust, Bodø, Norway
4. Faculty of Humanities, Sports and Educational Science, Department of Educational Science, University of South-Eastern Norway, Kongsberg, Norway
5. Department of Behavioural Medicine, Institute of Basic Medical Sciences, Faculty of Medicine, University of Oslo, Lorenskøg, Norway