1. Department of Pediatric dentistry, School and Hospital of Stomatology, Guangdong Engineering Research Center of Oral Restoration and Reconstruction, Guangzhou Key Laboratory of Basic and Applied Research of Oral Regenerative Medicine, Guangzhou Medical University, Guangzhou, Guangdong 510182, China
2. School of Electronic Engineering, Chaohu University, Anhui 238024, China
3. College of Physics and Materials Science, Tianjin Normal University, Tianjin 300387, China