1. School of Information Science and Technology, Dalian Maritime University, Dalian, China
2. School of Computer Science and Technology, Harbin Institute of Technology, Shenzhen, China
3. Artificial Intelligence Thrust, Hong Kong University of Science and Technology, Sai Kung, Hong Kong
4. National Clinical Research Center for Geriatrics, West China Hospital Sichuan University, and the Med-X Center for Manufacturing, Sichuan University, Chengdu, China
5. Department of Bioengineering, Imperial College London, London, U.K.