Simpson, JL. (1977). Delayed fertilization and Down's syndrome
. JAMA-JOURNAL OF THE AMERICAN MEDICAL ASSOCIATION, 238(17), 1811b-11811. 10.1001/jama.238.17.1811b
Simpson, JL. (1977). Delayed fertilization and Down's syndrome
. JAMA-JOURNAL OF THE AMERICAN MEDICAL ASSOCIATION, 238(17), 1811b-11811. 10.1001/jama.238.17.1811b