1. College of Mechanical and Electrical Engineering, Zhongkai University of Agriculture and Engineering, Guangzhou, China
2. School of Control Science and Engineering and the Center for Intelligent Medical Engineering, Shandong University, Jinan, China
3. Faculty of Information Science and Technology, Zhongkai University of Agriculture and Engineering, Guangzhou, China
4. School of Computer Science and Engineering, Sun Yat-sen University, Guangzhou, China