[1] Vestfold Hosp Trust, Norwegian Natl Advisory Unit Ageing & Hlth, Tonsberg, Norway
[2] Levanger Hosp, Nord Trondelag Hosp Trust, Dept Med, Levanger, Norway
[3] Norwegian Inst Publ Hlth, Dept Chron Dis & Ageing, Oslo, Norway
[4] UCL, London, England
[5] Camden & Islington NHS Fdn Trust, London, England
[6] Oslo Univ Hosp, Dept Geriat Med, Oslo, Norway
[7] Univ Oslo, Inst Clin Med, Fac Med, Oslo, Norway
[8] Oslo Univ Hosp, Geriat Dept, Oslo, Norway