Relationship Between the Changes in Placental Blood Flow Resistance Assessed by Doppler Technique and Maternal Serum Placental Aminopeptidases, which Degrade Vaso-Active Peptides, in Pre-Eclampsia - Asada, Y; Mizutani, S; Kasugai, M; Kurauchi, O; Tomoda, Y (Hormone and Metabolic Research, 1992)