1. State Key Laboratory of Oral Disease, National Clinical Research Center for Oral Diseases West China Hospital of Stomatology, Sichuan University Chengdu China
2. Department of Oral Maxillofacial Surgery West China Hospital of Stomatology, Sichuan University Chengdu China
3. Emergency Department West China Hospital of Stomatology, Sichuan University Chengdu China
4. Maine Medical Center Research Institute Scarborough Maine USA