1 Professor, Department of Preventive and Restorative Dental Sciences, Division of Prosthodontics, School of Dentistry, University of California, San Francisco, San Francisco, CA.
2 Professor, Arthur A. Dugoni School of Dentistry, University of the Pacific, San Francisco, CA.
3 Clinical Associate Professor, Department of Periodontics, University of Washington, Seattle, WA.
4 Professor and Chair of Periodontology, Department of Orofacial Sciences, University of California, San Francisco, San Francisco, CA.