World Health Organization Centers for Disease Control and Prevention (U.S.) Congenital abnormalities - epidemiology Congenital abnormalities - prevention and control Developing countries International Clearinghouse for Birth Defects Monitoring Systems Neural tube defects Public health surveillance Atlases Centers for Disease Control and prevention Communicable diseases Congenital abnormalities Epidemiology International Clearinghouse for Birth Defects Monitoring System Neural tube Defects Public Surveillance Vaccination