TY - JOUR TI - VALUE OF HIGH AND LOW MATERNAL SERUM ALPHA-FETOPROTEIN LEVELS IN SCREENING SINGLETON PREGNANCIES AU - MINARETZIS, D AU - TSIONOU, C JO - American Journal of Obstetrics and Gynecology PY - 1991 VL - 165 TODO - 3 SP - 780 PB - Mosby Year Book Inc SN - 0002-9378, 1097-6868 TODO - 10.1016/0002-9378(91)90331-K TODO - null TODO - null ER -