1. Department of Econometrics and Operations Research/Center for Economic Research (CentER), Tilburg University, 5000 LE Tilburg, Netherlands; Centrum voor Wiskunde en Informatica, 1098 XG Amsterdam, Netherlands; and Theoretical Biology and Bioinformatics, Utrecht University, 3508 TC Utrecht, Netherlands
2. Department of Econometrics and Operations Research/Center for Economic Research (CentER), Tilburg University, 5000 LE Tilburg, Netherlands
3. Institute of Radiooncology, Helmholtz-Zentrum Dresden-Rossendorf, Dresden, Germany; Department of Radiotherapy and Radiooncology, University Hospital Carl Gustav Carus at the Technische Universität Dresden, Dresden, Germany; and Department of Radiation Oncology (MAASTRO), GROW School for Oncology and Developmental Biology, Maastricht University Medical Center, Maastricht, Netherlands