1. Department of Radiation Oncology (MAASTRO), GROW-School for Oncology and Developmental Biology; Maastricht University Medical Centre; Maastricht the Netherlands
2. Department of Health Services Research, CAPHRI School for Public Health and Primary; Maastricht University; Maastricht the Netherlands
3. Faculty of Psychology; Open University of the Netherlands; Heerlen the Netherlands
4. Institute Verbeeten; Department of Radiation Oncology; Tilburg the Netherlands
5. Department of Methodology & Statistics, Faculty of Health, Medicine and Life Sciences; Maastricht University; Maastricht the Netherlands