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Distribution of studied communities in the states of Paraíba and Rio Grande do Norte, Northeast Brazil. 1 Bernadino Batista, 2 Poço Dantas, 3 Uirauna, 4 Vieirópolis, 5 Santa Cruz, 6 São Francisco, 7 Lagoa, 8 Jericó. Triangle represents the occurrence area of the SPOAN syndrome in the state of Rio Grande do Norte
