1. Division of Advanced Prosthodontics, University of California, Los Angeles, California 90095, United States
2. Division of Diagnostic and Surgical Sciences, School of Dentistry, University of California, Los Angeles, California 90095, United States
3. Department of Pathology, School of Medicine, Johns Hopkins University, Baltimore, Maryland 21205, United States
4. Orthopedic Hospital Research Center, University of California, Los Angeles, California 90095, United States
5. Department of Bioengineering, University of California, Los Angeles, California 90095, United States