References
- Coupland, M. A. and Coupland, A. I. (1988) Seasonality, incidence and sex distribution of cleft lip and palate births in Trent Region, 1973–1982, Cleft Palate Journal, 25, 33–37.
- Jensen, B. L., Kreiborg, S., Dahl, E. and Fogh-Andersen, P. (1988) Cleft lip and palate in Denmark, 1976–1981 epidemiology, variability, and early somatic development, Cleft Palate Journal, 25, 258–269.
- Knox, G. and Braithwaite, F. (1962) Cleft lips and palates in Northumberland and Durham, Archives of Diseases in Children, 38, 66–70.
- Kernahan, D. A. and Stark, R. B. (1958) A new classification for cleft lip and palate, Plastic and Reconstructive Surgery, 22, 435.
- McMahon, B. and McKeown, T. (1953) The incidence of harelip and cleft palate related to birth rank and maternal age, American Journal of Human Genetics, 5, 176–183.
- Owens, J. R., Jones, J. W. and Harris, F. (1985) Epidemiology of facial clefting, Archives of Diseases in Children, 60, 521–524.
- Rank, B. K. and Thomson, J. A. (1960) Cleft lip and palate in Tasmania, Medical Journal of Australia, 2, 681–688.
- Srivastaua, S. and Rang, R. L. (1990) Facial clefting in Kuwait and England: a comparative study, British Journal of Plastic Surgery, 43, 457–462.
- Womersley, J. and Stone, D. H. (1987) Epidemiology of facial clefts, Archives of Diseases in Children, 62, 717–720.