1. Department of Research, Netherlands Comprehensive Cancer Organisation, Utrecht, The Netherlands
2. Department of Health Technology and Services Research, Faculty of Behavioural, Management and Social Sciences, Technical Medical Centre, University of Twente, Enschede, The Netherlands
3. Department of Surgical Oncology, Canisius Wilhelmina Hospital, Nijmegen, The Netherlands
4. Department of Surgical Oncology, Erasmus Medical Centre Cancer Institute, Rotterdam, The Netherlands
5. Department of Radiation Oncology, Institut Curie, Paris, France