1. (Incidence of cleft lip and palate: constant or increasing?);Fogh-Anderson, P.;Acta chir. scand,1961
2. (Declining incidence of central nervous system anomalies in New York State);Gittelsohn, A.M.; Milham, S.;Brit. J. prev. soc. Med,1962
3. (Epidemiology of congenital clefts of the lip and palate);Greene, J.C.;Publ. Hith Rep. (Wash.),1963
4. and operative mortality in cleft lip and palate in Finland);Gylling, U.; Soivio, A.I.;Acta chir.scand,1962
5. Henderson, F. M. (1940). J. Speech Hearing Dis., 5, 285 (The incidence of cleft palate in Hawaii)