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Funding: This research was supported by a grant of the Division of Oral Health Policy, Ministry of Health and Welfare, Republic of Korea in 2014.
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Funding
This research was funded by NATIONAL INSTITUTES OF HEALTH, grant numbers K23ES024803 and R01ES030101 and the Maine Economic Improvement Fund.
Conflicts of Interest
The authors declare no conflict of interest. The funders had no role in the design of the study; in the collection, analyses, or interpretation of data; in the writing of the manuscript, or in the decision to publish the results.
Appendix A
Table A1. Percent change in plasma fluoride by demographic characteristi