Dall'Asta A, Paramasivam G, Lees C C
Centre for Fetal Care, Queen Charlotte's and Chelsea Hospital, Imperial College Healthcare NHS Trust, London, UK.
Obstetrics and Gynecology Unit, University of Parma, Parma, Italy.
Ultrasound Obstet Gynecol. 2017 Apr;49(4):549-552. doi: 10.1002/uog.17346.