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6. Demographic trends of Down's syndrome in Egypt. Hafez M, el-Tahan M, Zedan M, Eisa M. Hum Biol; 1984 Dec; 56(4):703-12. PubMed ID: 6241594 [No Abstract] [Full Text] [Related]
9. Paternal age and congenital malformations. Zhu JL, Madsen KM, Vestergaard M, Olesen AV, Basso O, Olsen J. Hum Reprod; 2005 Nov; 20(11):3173-7. PubMed ID: 16006461 [Abstract] [Full Text] [Related]
14. [Maternal age and the incidence of Down's syndrome]. Konstantinova B, Doĭcheva E, Petrova N. Akush Ginekol (Sofiia); 1982 Aug; 21(5):357-71. PubMed ID: 6217764 [No Abstract] [Full Text] [Related]
19. On the inadequacy of quinquennial data for analyzing the paternal age effect on Down's syndrome rates. Lamson SH, Cross PK, Hook EB, Regal R. Hum Genet; 1980 Dec; 55(1):49-51. PubMed ID: 6450155 [Abstract] [Full Text] [Related]