Authors: Yang, QH Sherman, SL Hassold, TJ Allran, K Taft, L Pettay, D Khoury, MJ Erickson, JD Freeman, SB

Citation: Qh. Yang et al., Risk factors for trisomy 21: Maternal cigarette smoking and oral contraceptive use in a population based case control study, GENET MED, 1(3), 1999, pp. 80-88