TY - JOUR AU - Salvesen, K Å; Lees, C; Abramowicz, J TI - Safe use of Doppler ultrasound during the 11 to 13 + 6-week scan: is it possible? JO - Ultrasound Obstet Gynecol VL - 37 PY - 2011 DO - 10.1002/uog.9025 SP - 625 EP - 628 N1 - et al. ER -