1. Instituto de Medicina Tropical, UNMSM, Lima, Perú.
2. Westat, Rockville, Maryland.
3. Hospital dos Servidores do Estado, Rio de Janeiro, Brazil.
4. Universidade de São Paulo at Ribeirão Preto, Brazil.
5. Hospital Nossa Senhora da Conceicao, Porto Alegre, Brazil.
6. Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD), NIH, Bethesda, Maryland.