1. Laboratory of Tissue Regeneration and Immunology and Department of Periodontics, Beijing Key Laboratory of Tooth Regeneration and Function Reconstruction, Capital Medical University School of Stomatology, Beijing, People's Republic of China.
2. Department of Oral and Maxillofacial Surgery, Xiangya Hospital, Central South Universtity, Changsha, Hunan, People's Republic of China.
3. Department of Oral and Maxillofacial Surgery, Xiangya Stomatological Hospital, Central South Universtity, Changsha, Hunan, People's Republic of China.
4. Salivary Gland Disease Center and Molecular Laboratory for Gene Therapy and Tooth Regeneration, Beijing Key Laboratory of Tooth Regeneration and Function Reconstruction, Capital Medical University School of Stomatology, Beijing, People's Republic of China.
5. Department of Stomatology, Yidu Central Hospital, Weifang Medical University, Weifang, Shandong, People's Republic of China.
6. Department of Biochemistry and Molecular Biology, Capital Medical University School of Basic Medical Sciences, Beijing, China.