Maternal Age and Down's Syndrome: The Shift of Affected Infants to Younger Mothers in Hokkaido

1. Penrose, L.S. : The effects of change in maternal age distribution upon the incidence of Mongolism. J. Ment. Defic. Res. 11: 54, 1967.

2. Uchida, I.A. : Epidemiology of Mongolism; the Manitoba study. Ann. N. Y. Acad. Sci. 171: 361, 1966.

3. Matsunaga, E. : Down's syndrome and maternal inbreeding. Acta Genet. Med. Gemell. 15: 224, 1966.

4. Smith, P.C., and Jacobs, P.A.: In Human Population Cytogenetics. Edinburgh, 1970, p. 159.

5. Tsubakihara, C. : The study of Mongolism; the third study. Acta Paediat. Japonica 64: 2131, 1960.

6. Polani, P.E. , Briggs. J. H. , Ford, C.E. , Clarke, C.M. , and Berg, J.M. : A Mongol girl with 46 chromosomes. Lancet i: 721, 1960.

7. Turpin, R. , and Lejeune, J. : Les Chromosomes Humains. Paris: Gauthier-Villars.