1. Division of Advanced Prosthodontics, University of California, Los Angeles, California 90095, United States
2. Department of Pathology, School of Medicine, Johns Hopkins University, Baltimore, Maryland 21205, United States
3. Department of Bioengineering, University of California, Los Angeles, California 90095, United States
4. Orthopaedic Hospital Research Center, University of California, Los Angeles, California 90095, United States