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Incidence of cleft lips, palates rising
1Center for Craniofacial Molecular Biology, School of Dentistry, University of Southern California, Los Angeles 90033.
Journal of the American Dental Association (1939)
|November 1, 1992
Abstract:
About 1:700 live human births are affected by cleft lip and palate. Socio-economic factors--teenage pregnancies, pregnancies in women older than 35, increased consumption of teratogens during early months of pregnancy--have resulted in increased numbers of congenital malformations in the United States.