1. Department of Radiation Oncology, Fudan University Shanghai Cancer Center, Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, China
2. Department of Radiation Oncology (MAASTRO), GROW School for Oncology and Developmental Biology, Maastricht University Medical Centre, Maastricht, The Netherlands
3. Department of Radiation Oncology, University of Pennsylvania, Philadelphia, PA, USA
4. Department of Radiation Oncology, Università Cattolica S Cuore, Rome, Italy