1. Department of Radiation Oncology, Sun Yat‐Sen Memorial Hospital Sun Yat‐Sen University Guangzhou Guangdong China
2. Department of Dentistry Air Force Hospital of Southern Theater Command of PLA Guangzhou Guangdong China
3. Department of Stomatology General Hospital of Central Theater Command of PLA WuHan China
4. Biophysics and Medical Imaging Lab, School of Medicine South China University of Technology Guangzhou Guangdong China