1. School of Computer Science and Technology, Guangdong University of Technology, Guangzhou, China
2. Faculty of Applied Sciences, Macao Polytechnic University, Macau, China
3. School of Information Science and Technology, Guangdong University of Foreign Studies, Guangzhou, China
4. Department of Computer and Information Science, University of Macau, Macau, China
5. Department of Radiology, State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, and the Guangdong Key Laboratory of Nasopharyngeal Carcinoma Diagnosis and Therapy, Sun Yat-sen University Cancer Center, Guangzhou, China