1. Department of Surgical Oncology; Erasmus MC Cancer Institute, 3075 EA; Rotterdam The Netherlands
2. Department of Research; Netherlands Comprehensive Cancer Organisation, 3511 DT; Utrecht The Netherlands
3. Department of Health Technology & Services Research; MIRA Institute for Biomedical Technology and Technical Medicine, University of Twente, 7500 EA; Enschede The Netherlands
4. Department of Surgery; Maxima Medical Center, 5504 DB; Veldhoven The Netherlands
5. Department of Surgical Oncology; Canisius Wilhelmina Hospital, 6532 SZ; Nijmegen The Netherlands
6. Department of Radiation Oncology; Institut Curie, 26, Rue d'Ulm, 75248 Paris cedex 05; France