1. Department of Radiation Oncology, University Medical Center Utrecht, Utrecht, The Netherlands.
2. Imaging Division, University Medical Center Utrecht, Utrecht, The Netherlands.
3. Department of Surgery, University Medical Center Utrecht, Utrecht, The Netherlands.
4. Department of Surgery, Alrijne Hospital, Leiderdorp, The Netherlands.
5. Department of Epidemiology, Julius Center for Health Sciences and Primary Care, University Medical Center Utrecht, Utrecht, The Netherlands.
6. University of Utrecht, Utrecht, The Netherlands.