| http://www.w3.org/ns/prov#value | - M. L. Lebr??o and Y. A. de O. Duarte collected the data, helped plan the study, including instrumentation, and revised the paper.AcknowledgmentsThis study was supported by grants from FAPESP/Brazil, the Brazilian Ministry of Health, and the Lemann Institute for Brazilian Studies at the University of Illinois at Urbana-Champaign.
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