1. Department of Radiation Oncology, Medical ArtificialIntelligence and Automation Laboratory, University of Texas Southwestern Medical Center, Dallas, TX, USA
2. Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai, China
3. Department of Radiation Oncology, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA
4. Heidelberg Ion Beam Therapy Center, Heidelberg University Hospital, Heidelberg, Germany