TY - JOUR A1 - Khoshwood, B. T1 - Risk of low birth weight associated with advanced maternal age among four ethnic four ethnic groups in United States Y1 - 2005 DO - 10.1007/s10995-005-2446-4 JF - Maternal and Child Health Journal VL - 9 IS - 1 SP - 3 EP - -9 ER -