1. Division of Advanced Prosthodontics, University of California at Los Angeles, 10833 Le Conte Avenue, Los Angeles, CA 90095, USA.
2. Division of Diagnostic and Surgical Sciences, University of California at Los Angeles, 10833 Le Conte Avenue, Los Angeles, CA 90095, USA.
3. Department of Bioengineering, University of California at Los Angeles, 420 Westwood Plaza, Los Angeles, CA 90095, USA.