1 College of Information Science and Technology, Chengdu University of Technology, Chengdu, People's Republic of China.
2 Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, The Shenzhen Key Laboratory for Low-cost Healthcare, 1068 Xueyuan Avenue, Shenzhen University Town, Shenzhen, 518055, People's Republic of China.
3 Shenzhen College of Advanced Technology, University of Chinese Academy of Sciences, 1068 Xueyuan Avenue, Shenzhen University Town, Shenzhen, 518055, People's Republic of China.
4 Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, The Shenzhen Key Laboratory for Low-cost Healthcare, 1068 Xueyuan Avenue, Shenzhen University Town, Shenzhen, 518055, People's Republic of China. wang.lei@siat.ac.cn.