1. Engineering Research Center of Optical Instrument and System, Key Lab of Optical Instruments and Equipment for Medical Engineering, Ministry of Education, Shanghai Key Lab of Modern Optical System, University of Shanghai for Science and Technology, Shanghai 200093, China
2. Department of Clinical Laboratory, Xinhua Hospital, Shanghai Jiao Tong University School of Medicine, 1665 Kongjiang Road, Shanghai 200092, China
3. Department of Preventive Dentistry, Graduate School of Dentistry, Osaka University, Osaka 565-0871, Japan
4. Oono Joint Research laboratory, Graduate School of Engineering, Osaka University, Osaka 565-0871, Japan