TY - JOUR A1 - Yoon, P.W. A1 - Freeman, S.B. A1 - Sherman, S.L. A1 - Taft, L.F. A1 - Gu, Y. A1 - Pettay, D. A1 - Flanders, W.D. A1 - Khoury, M.J. A1 - Hassold, T.J. T1 - Advanced maternal age and the risk of Down syndrome characterized by the meiotic stage of chromosomal error: A population-based study Y1 - 1996 VL - 58 IS - 3 ER -