Centers for Disease Control and Prevention (U.S.) 2 International Clearinghouse for Birth Defects Monitoring Systems 2 World Health Organization 2 Atlases 1 Congenital abnormalities 1 Congenital abnormalities - epidemiology 1 Congenital abnormalities - prevention and control 1 Developing countries 1 Neural tube Defects 1 Neural tube defects 1 Public Surveillance 1 Public health surveillance 1