1. Key Laboratory of OptoElectronic Science and Technology for Medicine of Ministry of Education, Fujian Provincial Key Laboratory of Photonics Technology, Fujian Normal University, Fuzhou 350007, P. R. China
2. School of Electronic and Mechanical Engineering, Fujian Polytechnic Normal University, Fuqing, Fujian 350300, P. R. China
3. Department of Pathology, Fujian Medical University Union Hospital, Fuzhou 350001 P. R. China
4. Department of General Surgery, Nanfang Hospital, Southern Medical University, Guangzhou 510515, P. R. China
5. College of Physics and Electronic Information Engineering, Minjiang University, Fuzhou 350108, P. R. China