1. School of Computer Science and Engineering, South China University of Technology, Guangzhou, China
2. Department of Radiology, the State Key Laboratory of Oncology in South China, the Guangdong Key Laboratory of Nasopharyngeal Carcinoma Diagnosis and Therapy, the Collaborative Innovation Center for Cancer Medicine, and the Sun Yat-sen University Cancer Center, Sun Yat-sen University, Guangzhou, China