1. School of Computer Science and Technology, Guangdong University of Technology, Guangzhou, China
2. School of Information Science and Technology, Guangdong University of Foreign Studies, Guangzhou, China
3. Faculty of Applied Sciences, Macao Polytechnic University, Macau, China
4. Faculty of Science and Technology, University of Macau, Macau, China
5. First Affiliated Hospital of Sun Yat-Sen University, Guangzhou, China