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4. Department of Health and Human Services. Office of the Secretary. Public Health Service Recommendation for Fluoride Concentration in Drinking Water for Prevention of Dental Caries. Federal Register, 2015 (FR Doc. 2015-10201). Available at: https://www.federalregister.gov/documents/2015/05/01/2015-10201/public-health-service-recommendation-for-fluoride-concentration-in-drinking-water-for-prevention-of.
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