1. Biostatistics and Medical Informatics Research Group (BISI), Vrije Universiteit Brussel, Brussels, Belgium
2. Department of Radiotherapy, Universitair Ziekenhuis Brussel (UZB), Brussels, Belgium
3. Interuniversity Centre for Health Economics Research (I-CHER), Vrije Universiteit Brussel, Brussels, Belgium
4. Department of Radiology, Universitair Ziekenhuis Brussel, Brussels, Belgium