NavGeneral InfoEmail Print Geography United States of America (USA) Coverage type Country Time period covered 01/2009 - 12/2009 Data type Survey: Household Summary United States National Children"s Study 2009 Citation Contributors National Institutes of Health (NIH) Suggested citation National Institutes of Health (NIH). United States National Children's Study 2009. GHDx Entry last modified on: Mar 7, 2022