1 Guangdong Key Laboratory of Intelligent Information Processing, College of Electronics and Information Engineering, Shenzhen University, Shenzhen 518052, China.
2 School of Biomedical Engineering, Shenzhen University Health Science Center, Shenzhen 518037, China.
3 School of Communications and Information Engineering, Nanjing University of Post and Telecommunications, Nanjing 210042, China.
4 School of Stomatology, Peking University, Beijing 100081, China.