The Effect of Trans-Abdominal Chorionic Villus Sampling on Fetal Heart Rate and Placental Vascular Resistance Index: A Color Doppler Ultrasound Study - Farshchian, Nazanin; Naleini, Farhad; Farshchian, Negin; Kamangar, Parisa (Acta Medica Iranica, 2021)