[1] Leiden University Medical Center,Department of Medical Oncology
[2] Leiden University Medical Center,Department of Surgery
[3] Haga Hospital,Department of Surgery
[4] Admiraal de Ruyter Hospital,Department of Surgery
[5] Alrijne Hospital,Department of Surgery
[6] Diakonessenhuis,Department of Surgery
[7] Reinier de Graaf Gasthuis,Department of Medical Oncology
[8] LangeLand Hospital,Department of Internal Medicine
[9] Haaglanden Medical Center,Department of Surgery
[10] Groene Hart Hospital,Department of Surgery
[11] Leiden University Medical Center,Department of Gerontology and Geriatrics