Mutton D, Albertan E, Hook EB. Cytogenetic and epidemiological findings in Down syndrome, England and Wales 1989 to 1993. National Down Syndrome Register and the Association of Clinical Cytogeneticists. J Med Genet 1996; 33: 387 - 94.
Richards BW. Investigation of 142 mosaic mongols and mosaic parents of mongols: Cytogenetic analysis and maternal age at birth. J Ment Defic Res 1974; 18:199.
Pangalos C, Avramopoulos D, Blouin JL. Understanding the mechanism(s) of mosaic trisomy 21 by using DNA polymorphism analysis. Am J Hum Genet 1994; 54:475 - 581.
Vrijheid M, Dolk H, Stone D, Abramsky L, Alberman E, Scott JE. Socioeconomic inequalities in risk of congenital anomaly. Arch Dis Child 2000; 82:349 - 52.
Murdoch JC, Ogston SA. Characteristics of parents of Down's children and control children with respect to factors present before conception. J Ment Defic Res 1984; 28:177 - 187.
NIH Conference. Alzheimer's disease and Down syndrome: New Insights. Ann Intern Med 1985; 103:566 - 678.
Schupf N, Kapell D, Lee JH, Ottman R, Mayeux R. Increased risk of Alzheimer's disease in mothers of adults with Down's syndrome. Lancet 1994; 344: 353 - 356.
McIntosh GC, Olshan AF, Baird PA. Paternal age and the risk of birth defects in offspring. Epidemiology 1995; 6:282 - 288.
Stoll C, Alembik Y, Dott B, Roth MP. Study of Down syndrome in 238,942 consecutive births. Ann Genet 1998; 41:44 - 51.
El-Mazni A and El-Temtamy SA. Some genetic aspects of congenital heart disease in Egyptian children. Gaz Egypt Paediatr Ass 1970;18:85 - 92.
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