1. West China College of Stomatology, Sichuan University; Department of Orthodontics; Chengdu Sichuan China 610041
2. West China Hospital of Stomatology, Sichuan University; Department of Orthodontics, State Key Laboratory of Oral Diseases; No. 14, Section Three, Ren Min Nan Road Chengdu Sichuan China 610041
3. West China Hospital, Sichuan University; Chinese Clinical Trial Registry, Chinese Ethics Committee of Registering Clinical Trials; No. 37, Guo Xue Xiang Chengdu Sichuan China 610041
4. Christian Medical College; Dental and Oral Surgery Department; Vellore Tamil Nadu India 632004
5. West China College of Stomatology, Sichuan University; Department of Oral and Maxillofacial Surgery, State Key Laboratory of Oral Diseases; No. 14, Section Three, Ren Min Nan Road Chengdu Sichuan China 610041