1. Department of Radiation Oncology, Medisch Spectrum Twente, Haaksbergerstraat 55, 7513 ER Enschede, The Netherlands
2. Laboratorium Pathologie Oost Nederland, 7512 ER Enschede, The Netherlands
3. Department of Radiation Oncology, Catharina Hospital, Eindhoven, The Netherlands
4. Department of Clinical Oncology, Leiden University Medical Center, 2333 ZA Leiden, The Netherlands
5. Arnhem Radiotherapeutic Institute, Arnhem, The Netherlands
6. Department of Research Methodology, Measurement, and Data Analysis, Faculty of Behavioral Science, University of Twente, 7500 AE Enschede, The Netherlands
7. Department of Clinical Epidemiology, Medisch Spectrum Twente, 7513 ER Enschede, The Netherlands
8. Radiotherapy Institute Steden en Omstreken, Deventer, The Netherlands
9. Radiotherapy Institute Friesland, Leeuwarden, The Netherlands
10. Department of Obstetrics and Gynaecology, Medisch Spectrum Twente, 7513 ER Enschede, The Netherlands
11. Comprehensive Cancer Centre North East, Enschede/Groningen, The Netherlands