1. State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases & Department of Cariology and Endodontics, West China Hospital of Stomatology Sichuan University Chengdu Sichuan China
2. Shanghai Ninth People's Hospital, College of Stomatology Shanghai Jiao Tong University School of Medicine Shanghai China
3. Department of Endodontics, the Dental College of Georgia Augusta University Augusta GA USA
4. State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology Sichuan University Chengdu Sichuan China