[1] Maastricht Univ, CAPHRI, Dept Hlth Serv Res, NL-6200 MD Maastricht, Netherlands
[2] Maastricht Univ, CAPHRI, Dept Methodol & Stat, NL-6200 MD Maastricht, Netherlands
[3] Univ Turku, Turku Univ Hosp, Dept Nursing Sci, SF-20500 Turku, Finland
[4] Univ Witten Herdecke, Sch Nursing Sci, Dept Fac Hlth, Witten, Germany
[5] Hosp Clin Barcelona, Dept Nursing, Nursing, Barcelona, Spain
[6] Toulouse Univ Hosp, Dept Geriatr, Alzheimer Acute Unit, Toulouse, France
[7] Univ Tartu, Dept Internal Med, Tartu, Estonia
[8] Lund Univ, Fac Med, Swedish Inst Hlth Sci, Dept Hlth Sci, S-22100 Lund, Sweden
[9] Univ Manchester, Sch Nursing Midwifery & Social Work, Personal Social Serv Res Unit, Manchester M13 9PL, Lancs, England