[1] Innlandet Hosp Trust, Res Ctr Age related Funct Decline & Dis, Pb 68, N-2312 Ottestad, Norway
[2] Vestfold Hosp Trust, Norwegian Natl Ctr Aging & Hlth, Tonsberg, Norway
[3] Univ Oslo, Inst Clin Med, Oslo, Norway
[4] Akershus Univ Hosp, Hlth Serv Res Unit, Oslo, Norway
[5] Innlandet Hosp Trust, Dept Res & Innovat, Ottestad, Norway
[6] Univ Copenhagen, Dept Publ Hlth, Copenhagen, Denmark