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A case-control study of topical and supplemental fluoride use and osteosarcoma risk.

Dr. Hayes is the director of Dental Services, Division of Commonwealth Medicine, Office of Clinical Affairs, University of Massachusetts Medical School, Worcester, MA; a clinical professor, Department of Health Policy and Health Services Research, Henry M. Goldman School of Dental Medicine, Boston University, Boston, MA; and a lecturer, Department of Oral Health Policy and Epidemiology, Harvard School of Dental Medicine, Boston, MA. Dr. Douglass is a professor emeritus, Department of Or