1 State Key Laboratory of Oral Disease, West China College of Stomatology, Chengdu, People's Republic of China.
2 State Key Laboratory of Oral Disease, West China College of Stomatology, and Department of Cleft Lip and Palate Surgery, West China Stomatological Hospital, Sichuan University, Chengdu, People's Republic of China.
3 State Key Laboratory of Oral Disease, West China College of Stomatology, Chengdu, People's Republic of China, Department of Growth and Development and Section of Orthodontics, School of Dentistry, University of California, Los Angeles, Los Angeles, Calif.