1. Department of Orthodontics, Shandong Provincial Key Laboratory of Oral Biomedicine, School of Stomatology, Shandong University, Jinan, People's Republic of China.
2. Salivary Gland Disease Center, Molecular Laboratory for Gene Therapy & Tooth Regeneration, Beijing Key Laboratory of Tooth Regeneration and Function Reconstruction, School of Stomatology, Capital Medical University, Beijing, People's Republic of China.
3. Jinan Municipal Hospital of Traditional Chinese Medicine, Jinan, People's Republic of China.
4. Department of Stomatology, Yidu Central Hospital, Weifang Medical University, Qingzhou, People's Republic of China.
5. Department of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Capital Medical University, Beijing, People's Republic of China.