1. Department of Mental Health, St. Olav University Hospital HF, Trondheim, Norway;
2. Faculty of Medicine and Health Science, Norwegian University of Science and Technology, Trondheim, Norway;
3. Department of Public Health and Nursing, Faculty of Medicine and Health Care, Norwegian University of Science and Technology (NTNU), Trondheim, Norway;
4. Norwegian National Advisory Unit on Ageing and Health, Vestfold Hospital Trust, Tønsberg, Norway