1. Department of Electrical Engineering, Chalmers University of Technology, Göteborg, Sweden;
2. Department of Radiation Oncology, University Hospital Erlangen, Erlangen, Germany;
3. Department of Radiation Oncology, Erasmus MC Cancer Institute, Rotterdam, the Netherlands;
4. Department of Radiation Oncology, Cancer Center Amsterdam, Amsterdam UMC, University of Amsterdam, Amsterdam, the Netherlands;
5. Department of Colorectal Oncology, N.N.Blokhin Russian Cancer Research Center, Moscow, Russia;
6. Radioonkologische Klinik, Universitätsklinikum Tübingen, Tübingen, Germany;
7. Kantonsspital Aarau, Radio-Onkologie-Zentrum KSA-KSB, Aarau, Switzerland;
8. Klinik für Radioonkologie und Strahlentherapie, Charité Universitätsmedizin Berlin, Berlin, Germany;
9. Klinikum der Universität München—Campus Grosshadern, München, Germany;
10. Department of Radiation Oncology, Centrum Diagnostyki i Terapii Onkologicznej Nu-Med, Zamość, Poland;
11. Department of Radiation Oncology, Thomas Jefferson University, Philadelphia, PA, USA;
12. Department of Radiation Oncology, University of Maryland Baltimore, Baltimore, MD, USA;
13. Department of Radiation Oncology, University of California, San Francisco, CA, USA