1. Research Centre for Smart Wearable Technology, Institute of Textiles and Clothing, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong 999077, P. R China
2. The Hong Kong Polytechnic University Shenzhen Research Institute, Shenzhen 518057, P. R. China
3. Research Institute for Intelligent Wearable Systems, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong 999077, P. R. China