1. Department of Orthodontics, Guangdong Provincial Key Laboratory of Stomatology, Guanghua School of Stomatology, Hospital of Stomatology, Sun Yat-sen University, 56 Lingyuan West Road, Guangzhou, Guangdong 510055, China
2. Institutes of Physical Science and Information Technology, Anhui University, 110 Jiulong Road, Hefei, Anhui 230601, China
3. Hefei National Laboratory of Physical Sciences at Microscale, Department of Chemistry, University of Science and Technology of China, 96 Jinzhai Road, Hefei, Anhui 230026, China