Maternal age and risk for trisomy 21 assessed by the origin of chromosome nondisjunction: a report from the Atlanta and National Down Syndrome Projects
Emily Graves Allen, Sallie B. Freeman, Charlotte M. Druschel, Charlotte A. Hobbs, Leslie A. O’Leary, Paul A. Romitti, Marjorie H. Royle, Claudine P. Torfs, Stephanie L. Sherman
Abstract