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- Dental Clinical Epidemiology Fellow, Department of Dental Public Health and Hygiene, University of California, San Francisco.
- Professor and Chair, Division of Oral Medicine, University of California, San Francisco.
- Postgraduate Research Dentist, Department of Stomatology, University of California, San Francisco.
- NIH Visiting Scholar in the Department of Stomatology, University of California, San Francisco, and is associated with the National and State Cancer Research Program in Sao Paulo, Brazil.