1. Guangdong Provincial Engineering and Technology Center of Advanced and Portable Medical Devices, School of Biomedical Engineering, Sun Yat-Sen University, Shenzhen 518107, China
2. Department of Biomedical Engineering, The Hong Kong Polytechnic University, Hong Kong, People's Republic of China
3. Research Institute of Sun Yat-Sen University in Shenzhen, Shenzhen, 518057, P. R. China