1. State Key Laboratory of Oral Diseases & National Center for Stomatology & National Clinical Research Center for Oral Diseases West China Hospital of Stomatology Sichuan University Chengdu Sichuan 610041 China
2. National Engineering Research Center for Biomaterials and College of Biomedical Engineering Sichuan University Chengdu Sichuan 610064 China
3. Orthopaedic Research Institute Department of Orthopaedics West China Hospital Sichuan University Chengdu Sichuan 610041 China
4. Paediatric Dentistry, Faculty of Dentistry University of Hong Kong Hong Kong SAR China