title: Safe use of Doppler ultrasound during the 11 to 13 + 6-week scan: is it possible?
authors: National Center for Fetal Medicine, St. Olav University Hospital of Trondheim and Department of Laboratory Medicine, Women's and Child Health, Norwegian University of Science and Technology, N 7006 Trondheim, Norway. pepe.salvesen@ntnu.no
authors: K Å
authors: KÅ
authors: Salvesen
authors: C
authors: C
authors: Lees
authors: J
authors: J
authors: Abramowicz
authors: C
authors: C
authors: Brezinka
authors: G
authors: G
authors: Ter Haar
authors: K
authors: K
authors: Maršál