[1] University of Oslo, Institute of Health and Society, Research Center for habilitation and rehabilitation services and models (CHARM), Blindern, P.O.Box 1130, Oslo
[2] Inland Norway University of Applied Sciences, P.O.Box 400, Elverum
[3] The Arctic University of Norway, Faculty of Health UIT, Campus, Narvik
[4] Oslo University Hospital, Department of Geriatric Medicine, Nydalen, P.O box 4956, Oslo
[5] Aarhus University, Institute of Public Health, Hoegh-Guldbergs Gade 6 A, Aarhus
[6] Hammel Neurorehabilitation and Research Centre, Voldbyvej 15 8450, Hammel
[7] Norwegian National Advisory Unit on Ageing and Health (Ageing and Health), P. O. Box 2136, Tønsberg
[8] Oslo University Hospital, Institute of Clinical Medicine, University of Oslo, Department. of Geriatric Medicine, P.O box 4956 Nydalen, Oslo
[9] Oslo University Hospital, Dept. of Geriatric Medicine, and Dept. of Physical Medicine and Rehabilitation, P.O box 4956 Nydalen, Oslo