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12. [20 cases of trisomy 18. Sex-ratio in relation to age of the mother]. Le Marec BM; Lair JC; Kérisit J; Le Mée F; Sénécal J Ann Pediatr (Paris); 1977 Feb; 24(2):125-36. PubMed ID: 16211953 [No Abstract] [Full Text] [Related]