1. State Key Laboratory of Precision Measurement Technology and Instrument, Tianjin University, Tianjin, China
2. China and Tianjin Key Laboratory of Biomedical Detecting Techniques and Instruments, Tianjin University, Tianjin, China
3. Department of Biomedical Engineering, Hefei University of Technology, Hefei, China
4. School of Electronic Information Engineering, Yangtze Normal University, Chongqing, China