1. State Key Laboratory of Precision Measurement Technology and Instruments, Tianjin University, Tianjin, China;
2. Tianjin Key Laboratory of Biomedical Detecting Techniques & Instruments, Tianjin University, Tianjin, China;
3. Institute of Biomedical Engineering, Chinese Academy of Medical Science and Peking Union Medical College, Tianjin, China
4. School of Physics and Electron Engineering, Yangtze Normal University, Chongqing, China;