[1] Univ Iceland, Dept Genet, Landspitali Univ Hosp, Fac Med, IS-101 Reykjavik, Iceland
[2] Stakes, FIN-00531 Helsinki, Finland
[3] Stockholm Cty Council, Ctr Gerontol & Hlth Econ, SE-11324 Stockholm, Sweden
[4] Karolinska Inst, SE-11324 Stockholm, Sweden
[5] Soltun Nursing Home, Reykjavik, Iceland
[6] Umea Univ, Sect Geriatr Med, Dept Community Med & Rehabil, SE-90187 Umea, Sweden
[7] Diakonhjemmet Hosp, N-0319 Oslo, Norway
[8] Umea Univ, Dept Nursing, SE-90187 Umea, Sweden
[9] Copenhagen Univ Hosp, Dept Geriatr, DK-2400 Copenhagen NV, Denmark