@article{silva_moreno_forte_sampaio_2009,  title={Natural fluoride levels from public water supplies in Piauí State, Brazil},  volume={14},  ISSN={1413-8123},  url={https://doi.org/10.1590/S1413-81232009000600030},  DOI={10.1590/S1413-81232009000600030},  number={6},  journal={Ciência & Saúde Coletiva},  publisher={ABRASCO - Associação Brasileira de Saúde Coletiva},  author={Silva, Josiene Saibrosa da and Moreno, Wallesk Gomes and Forte, Franklin Delano Soares and Sampaio, Fábio Correia},  year={2009},  month={Dec},  pages={2215–2220} }