1. Istituto Nazionale di Fisica Nucleare Sezione di Catania Catania Italy
2. Institute of Radiation Physics Lausanne University Hospital Lausanne University Lausanne Switzerland
3. Department of Radiation Oncology Lausanne University Hospital Lausanne Switzerland
4. Radio‐Oncology Laboratory DO/CHUV Lausanne University Hospital Lausanne Switzerland
5. Centre for Medical Radiation Physics University of Wollongong New South Wales Australia
6. Department of Radiation Oncology Washington University School of Medicine St. Louis Missouri USA