1. Beijing Key Laboratory of Tooth Regeneration and Function Reconstruction, Capital Medical University School of Stomatology, Beijing, China.
2. Mucosal Immunology Section, National Institute of Dental and Craniofacial Research, National Institutes of Health, Bethesda, Maryland.
3. Department of Stomatology, Beijing Tiantan Hospital, Capital Medical University, Beijing, China.
4. Department of Pediatrics, Beijing Chaoyang Hospital, Capital Medical University, Beijing, China.