[1] Innlandet Hosp Trust, Res Ctr Age Related Funct Decline & Dis, Ottestad, Norway
[2] Univ Oslo, Fac Med, Oslo, Norway
[3] Vestfold Hosp Trust NO, Norwegian Natl Ctr Ageing & Hlth, Tonsberg, Norway
[4] Molde Univ Coll, Fac Hlth & Social Sci, Molde, Norway
[5] Oslo Univ Hosp, Dept Geriatr Med, Oslo, Norway
[6] Univ Oslo, Inst Clin Med, Campus Ahus, Oslo, Norway
[7] Akershus Univ Hosp, Hlth Serv Res Unit, Nordbyhagen, Norway