World Health Organization 3 Centers for Disease Control and Prevention (U.S.) 2 Congenital abnormalities - epidemiology 2 Congenital abnormalities - prevention and control 2 Developing countries 2 International Clearinghouse for Birth Defects Monitoring Systems 2 Neural tube defects 2 Public health surveillance 2 Atlases 1 Centers for Disease Control and prevention 1 Congenital abnormalities 1 Diet 1 Epidemiologic Methods 1 International Clearinghouse for Birth Defects Monitoring System 1 Neural tube Defects 1 Nutritional Physiological Phenomena 1 Public Surveillance 1 adverse effects 1