1. Laboratory of Microelectronic Engineering, Medical Electronics and Information Technology Engineering Research Center, Chongqing Engineering Laboratory of Digital Medical Equipment and System, Chongqing Engineering Research Center of Medical Electronics and Information Technology, Chongqing University of Posts and Telecommunications, Chongqing 400065, China
2. Key Laboratory of Opto-Technology and Intelligent Control, Ministry of Education, Lanzhou Jiao Tong University, Lanzhou 730070, China