1. Costa Rican Birth Defects Register Center (CREC) Costa Rican Institute of Research and Education in Nutrition and Health (INCIENSA) Cartago Costa Rica
2. Hospital Nacional de Niños “Dr. Carlos Sáenz Herrera”, Caja Costarricense del Seguro Social San José Costa Rica
3. Children's Hospital Colorado Aurora Colorado USA
4. University of Colorado Denver School of Medicine Aurora Colorado USA