1. Department of Stomatology, Nanjing Maternity and Child Health Medical Institute, Obstetrics and Gynecology Hospital Affiliated to Nanjing Medical University, Nanjing, Jiangsu 210029, P.R. China
2. Department of Pathogen and Immunology, Discipline of Chinese and Western Integrative Medicine, College of Basic Medicine, Nanjing University of Chinese Medicine, Nanjing, Jiangsu 210023, P.R. China
3. Department of Stomatology, Ningbo Dental Hospital, Ningbo, Zhejiang 315100, P.R. China