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3. Epidemiology of cleft lip and palate. An attempt to rule out chance correlation;Saxen, I.;Br J Prev Soc Med,1975
4. Cigarette smoking as an etiological factor in cleft lip and palate;Ericson, A.; Kallen, B.; Westerholm, P.;Am J Obstet Gynecol,1979
5. Anticonvulsant drugs and congenital anomalies. Lancet 1968;Meadow, SR,1296