1. Department of Public Health and General Practice, Faculty of Medicine, Norwegian University of Science and Technology (NTNU), Trondheim, Norway, Innlandet Hospital Trust, Division Tynset, Tynset, Norway, St Olav's University Hospital, Trondheim, Norway,
2. Research Centre for Old Age Psychiatric Research, Innlandet Hospital Trust, Ottestad, Norway, The Norwegian Centre for Dementia Research, University Hospital Ullevaal, Oslo, Norway, Faculty of Medicine, University of Oslo, Oslo, Norway
3. Department of Public Health and General Practice, Faculty of Medicine, Norwegian University of Science and Technology (NTNU), Trondheim, Norway, Levanger Hospital, Nord-Trøndelag Hospital Trust, N - 7600 Levanger, Norway
4. Research Centre for Old Age Psychiatric Research, Innlandet Hospital Trust, Ottestad, Norway, The Norwegian Centre for Dementia Research, University Hospital Ullevaal, Oslo, Norway