1. Center for Smart Health, The Hong Kong Polytechnic University, Hong Kong, SAR, China
2. Smart Health Big Data Analysis and Location Services Engineering Laboratory of Jiangsu Province, Nanjing University of Posts and Telecommunications, Nanjing, China
3. Medical Informatics, Nantong University, Nantong, China
4. School of Electronic Information and Electronic Engineering, Chengdu University, Chengdu, China
5. Department of Electrical and Computer Engineering, University of Alberta, Edmonton, Canada