1. Division of Advanced Prosthodontics, School of Dentistry, University of California, Los Angeles, Los Angeles, California.
2. Department of Neurosurgery, The 2nd Affiliated Hospital of Harbin Medical University, Harbin, China.
3. Division of Diagnostic and Surgical Sciences, School of Dentistry, University of California, Los Angeles, Los Angeles, California.
4. Department of Bioengineering, University of California, Los Angeles, Los Angeles, California.