1. Discipline of Medical Gerontology, School of Medicine, Trinity College Dublin D08 NHY1, Ireland
2. Mercer’s Institute for Successful Ageing, St James’s Hospital, Dublin D08 NHY1, Ireland
3. Geriatrics Department, Inselspital and University of Bern, Bern 3010, Switzerland
4. Department of Health Care for Older People (HCOP), Queen’s Medical Centre, Nottingham University Hospitals NHS Trust, Nottingham NG7 2UH, UK
5. Department of Geriatric Medicine, Odense University Hospital, Odense 5000, Denmark