1. Dental and Craniofacial Research Institute and Section of Orthodontics, School of Dentistry, UCLA, Los Angeles, California.
2. UCLA and Orthopaedic Hospital Department of Orthopaedic Surgery and the Orthopaedic Hospital Research Center, University of California, Los Angeles, Los Angeles, California.
3. Department of Pathology and Laboratory Medicine, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, California.
4. Division of Plastic and Reconstructive Surgery, University of Southern California, Los Angeles, California.