1. Department of Geriatric Medicine; Diakonessenhuis Utrecht/Zeist/Doorn; Utrecht the Netherlands
2. Department of Geriatric Medicine; Gelre Hospitals; Apeldoorn the Netherlands
3. Department of Clinical Chemistry and Hematology; Gelre Hospitals; Apeldoorn the Netherlands
4. Department of Gastroenterology; Diakonessenhuis; Utrecht The Netherlands
5. Department of Surgery; Diakonessenhuis; Utrecht The Netherlands
6. Department of Surgery; Gelre Hospitals; Apeldoorn the Netherlands
7. Department of Internal Medicine; Medical Center Alkmaar; Alkmaar the Netherlands
8. Department of Internal Medicine; Academic Medical Center; Amsterdam the Netherlands