1. State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, People's Republic of China.
2. Division of Growth and Development, Section of Orthodontics, School of Dentistry, Dental and Craniofacial Research Institute, University of California, Los Angeles, Los Angeles, California, USA.
3. Department of Orthodontics, School of Dental Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA.
4. Division of Advanced Prosthodontics, School of Dentistry, University of California, Los Angeles, California, USA.
5. A. T. Still University School of Osteopathic Medicine in Arizona, Mesa, Arizona, USA.
6. UCLA Division of Plastic Surgery, Department of Orthopaedic Surgery, The Orthopaedic Hospital Research Center, University of California, Los Angeles, Los Angeles, California, USA