Surveillance for Anencephaly and Spina Bifida and the Impact of Prenatal Diagnosis-United States, 1985-1994 by Cragan, Janet D., Roberts, Helen E., Edmonds, Larry D., Khoury, Muin J., Kirby, Russell S., Shaw, Gary M., Velie, Ellen M., Merz, Ruth D., Forrester, Mathias B., Williamson, Roger A., Krihnamurti, Diane S., Stevenson, Roger E., Dean, Jane H.

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