1 Department of Orthopedic Surgery, Maastricht University Medical Centre, Maastricht, the Netherlands.
2 Section Geriatric Medicine, Division of General Internal Medicine, Department of Internal Medicine, Maastricht University Medical Centre, Maastricht, the Netherlands.
3 Department of Orthopedic Surgery, Maastricht University Medical Centre, Maastricht, the Netherlands; Care and Public Health Research Institute (CAPHRI), Maastricht University, Maastricht, the Netherlands.
4 Department of Geriatric Medicine, Zuyderland Medical Centre, Sittard-Geleen, the Netherlands.
5 Section Geriatric Medicine, Division of General Internal Medicine, Department of Internal Medicine, Maastricht University Medical Centre, Maastricht, the Netherlands; Cardiovascular Research Institute Maastricht (CARIM), Maastricht University, Maastricht, the Netherlands.