1. Department of Radiation Oncology, Fujian Medical University Union Hospital, Fuzhou, China
2. Department of Radiation Oncology, Fudan University Shanghai Cancer Center, Shanghai, China
3. Department of Radiology, Fujian Medical University Union Hospital, Fuzhou, China
4. Department of Radiation Oncology, University of Nebraska Medical Center, Omaha, NE, USA
5. Department of Radiology, The People’s Hospital of Fujian Traditional Chinese Medicine University, Fuzhou, China