1. National Center on Birth Defects and Developmental Disabilities; Centers for Disease Control and Prevention; Atlanta Georgia USA
2. Consultant; Global Maternal and Preconception Health; Healdsburg CA
3. Instituto de Nutrición de Centroamérica y Panamá; Guatemala
4. Carter Consulting, Inc; Atlanta Georgia USA
5. Guatemala Ministerio de Salud Pública y Asistencia Pública; Guatemala