1. Department of Geriatric Medicine; Elkerliek Hospital; Wesselmanlaan 25, 5705 HA Helmond, PO Box 98, 5700 AB Helmond The Netherlands
2. Julius Center for Health Sciences and Primary Care; University Medical Center; Utrecht The Netherlands
3. Departments of Cardiology; Pulmonary Disease and Clinical Laboratory, Meander Medical Center; Amersfoort The Netherlands
4. Department of Cardiology; Heart Lung Institute, University Medical Center; Utrecht The Netherlands