1. Department of Surgery, Catharina Hospital, 5623 EJ Eindhoven, The Netherlands
2. Department of Radiotherapy, Catharina Hospital, 5623 EJ Eindhoven, The Netherlands
3. GROW–School for Oncology and Reproduction, Maastricht University, 6211 LK Maastricht, The Netherlands
4. Department of Research, Netherlands Comprehensive Cancer Organization, P.O. Box 19079, 3501 DB Utrecht, The Netherlands