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 China
2. Department of Orthodontics; Stomatological Hospital Affiliated to Zunyi Medical University; Zunyi China
3. State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases; Department of Pediatric Dentistry; West China Hospital of Stomatology; Sichuan University; Chengdu China
4. Fulbright Research Scholar to China; Columbia University; New York New York