1. State Key Laboratory of Precision Measurement Technology and Instruments, Tianjin University, Tianjin 300072, China
2. College of Mechanical and Electronic Engineering, Guangdong Polytechnic Normal University, Guangzhou 510635, China
3. Tianjin Key Laboratory of Biomedical Detecting Techniques and Instruments, Tianjin University, Tianjin 300072, China
4. Medical Examination Centre, No. 254 Hospital of PLA, Tianjin 300142, China