1. Center for Intelligent Medical Electronics, School of Information Science and Technology, Fudan University, Shanghai, China
2. College of Communication and Art Design, University of Shanghai for Science and Technology, Shanghai, China
3. School of Sports Science and Engineering, East China University of Science and Technology, Shanghai, China
4. Department of Electrical and Computer Engineering, Worcester Polytechnic Institute, Worcester, MA, USA
5. Department of Bioengineering, Imperial College London, London, U.K.