1. Department of Periodontology, The Affiliated Hospital of Stomatology, Southern Medical University, Guangzhou, Guangdong, China.
2. Key Laboratory of Oral Medicine, Guangzhou Institute of Oral Disease, Stomatology Hospital of Guangzhou Medical University, Guangzhou, Guangdong, China.
3. Department of Periodontology, Hangzhou Dental Hospital, Savaid Medical School, University of Chinese Academy of Sciences, Hangzhou, Zhejiang, China.
4. Department of Periodontology, Savaid Medical School, University of Chinese Academy of Sciences.