1. Division of Cleft Lip and Palate Surgery, State Key Laboratory of Oral Diseases, West China College of Stomatology, Sichuan University, the People's Republic of China.
2. Oregon Health & Science University, Portland, Oregon.
3. Department of Orthodontics, State Key Laboratory of Oral Diseases, West China College of Stomatology, Sichuan University, the People's Republic of China.
4. Division of ENT, West China Hospital, Sichuan University, the People's Republic of China.