1 Section Geriatric Medicine, Division of General Internal Medicine, Department of Internal Medicine, Maastricht University Medical Centre, Maastricht, The Netherlands.
2 Department of Geriatric Medicine, Zuyderland Medical Centre, Heerlen-Sittard-Geleen, The Netherlands.
3 Department of Orthopedic Surgery, Maastricht University Medical Centre, Maastricht, The Netherlands.
4 Cardiovascular Research Institute Maastricht (CARIM), Maastricht, The Netherlands.