1. State Key Laboratory of Military Stomatology, Department of Periodontology; School of Stomatology, Fourth Military Medical University; Xi'an China
2. Shaanxi Key Laboratory of Stomatology, Biomaterials Unit; School of Stomatology, Fourth Military Medical University; Xi'an China
3. Department of Oral Medicine; Northwest Women's and Children's Hospital; Xi'an China
4. State Key Laboratory of Military Stomatology, Department of Paediatric Dentistry; School of Stomatology, Fourth Military Medical University; Xi'an China
5. State Key Laboratory of Military Stomatology, Department of Oral Biology; School of Stomatology, Fourth Military Medical University; Xi'an Shaanxi China
6. State Key Laboratory of Military Stomatology, Department of Oral and Maxillofacial Surgery; School of Stomatology, Fourth Military Medical University; Xi'an Shaanxi China