[1] St Olavs Univ Hosp, Sect Geriatr, Div Internal Med, NO-7006 Trondheim, Norway
[2] Norwegian Univ Sci & Technol, Unit Appl Clin Res, N-7034 Trondheim, Norway
[3] St Olavs Univ Hosp, Dept Radiotherapy & Oncol, Palliat Med Unit, NO-7006 Trondheim, Norway
[4] Norwegian Univ Sci & Technol, Fac Med, Dept Neurosci, N-7034 Trondheim, Norway
[5] Univ Aberdeen, Dept Publ Hlth, Aberdeen, Scotland