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Study site. (A) Map of Ecuador showing location of district of Quinindé, Esmeraldas Province (shaded circle) (courtesy of the General Libraries, University of Texas at Austin, TX). The recruitment area for the cohort was defined by the geographical boundaries of this district. (B) Map showing parishes the district of Quinindé including La Concordia. H, Hospital Padre Alberto Buffoni. (C) geographical location of households of cohort infants.
