[1] University of Oslo,Department of Behavioural Sciences in Medicine, Institute of Basic Medical Sciences, Faculty of Medicine
[2] University of Tromsø,Department of Community Medicine, Faculty of Health Sciences
[3] University of Bergen,Department of Global Public Health and Primary Care, Faculty of Medicine and Dentistry
[4] University of Bergen,Department of Clinical Medicine, Section for Psychiatry, Faculty of Medicine and Dentistry
[5] Norwegian University of Science and Technology,Department of Public Health and General Practice, Faculty of Medicine