1 Department of Health Technology and Services Research, Technical Medical Centre, University of Twente, Enschede, the Netherlands; Department of Research and Development, Netherlands Comprehensive Cancer Organisation (IKNL), Utrecht, the Netherlands. Electronic address: m.c.vanmaaren@utwente.nl.
2 Evidencio Medical Decision Support, Haaksbergen, the Netherlands.
3 Tumor Center Regensburg, Center for Quality Assurance and Health Services Research, University of Regensburg, Regensburg, Germany.
4 Radiotherapiegroep, Institution for Radiation Oncology, Arnhem, the Netherlands.
5 Department of Surgical Oncology, Canisius Wilhelmina Hospital, Nijmegen, the Netherlands.
6 Department of Health Technology and Services Research, Technical Medical Centre, University of Twente, Enschede, the Netherlands; Department of Research and Development, Netherlands Comprehensive Cancer Organisation (IKNL), Utrecht, the Netherlands.