1. Department of Health Services Research; CAPHRI; Maastricht University; The Netherlands
2. Department of Methodology & Statistics; CAPHRI; Maastricht University; The Netherlands
3. Department of Nursing Science; University of Turku; Turku University Hospital; Finland
4. Department: Faculty of Health; School of Nursing Science; Witten/Herdecke University; Germany
5. Department of Nursing; Hospital Clinic of Barcelona; Spain
6. Geriatrics Department; Toulouse University Hospital; France
7. Department of Internal Medicine; University of Tartu; Estonia
8. Department of Health Sciences; Faculty of Medicine; Lund University; The Swedish Institute for Health Sciences; Sweden
9. Personal Social Services Research Unit; School of Nursing; Midwifery and Social Work; University of Manchester; UK