1. Clinical Research Center of Shaanxi Province for Dental and Maxillofacial Diseases, Stomatology College of Xi’an Jiaotong University, Xi’an City, Shaanxi Province, China;
2. Department of Clinical Medicine, University of Bergen, Bergen, Norway;
3. State Key Laboratory of Oral Diseases, Sichuan University, Chengdu City, Sichuan Province, China