Althabe Fernando, Bergel Eduardo, Buekens Pierre, Sosa Claudio, Belizán José M
Perinatal Research Unit, Hospital de Clinicas, Piso 15, Av. Italia s/n, Montevideo CP11600, Uruguay.
Tulane School of Public Health and Tropical Medicine, 1440 Canal Street, Suite 2430, New Orleans, LA 70112, USA.
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