1. Laboratory of Tissue Regeneration and Immunology and Department of Periodontics, Beijing Key Laboratory of Tooth Regeneration and Function Reconstruction School of Stomatology, Capital Medical University Beijing China
2. Department of Orthodontics, School of Stomatology Capital Medical University Beijing China
3. School of Dental Medicine University of Pennsylvania Philadelphia Pennsylvania USA
4. Department of Orthodontics the Third Dental Center Peking University School of Stomatology Beijing China
5. Department of General Dentistry, School of Stomatology Capital Medical University Beijing China