[1] Rigshosp, Univ Copenhagen Hosp, Dept Clin Genet, Copenhagen, Denmark
[2] Rigshosp, Univ Copenhagen Hosp, Dept Fetal Med, Copenhagen, Denmark
[3] Nykobing F Hosp, Dept Pediat, Guldborgsund, Region Sjaellan, Denmark
[4] Hvidovre Univ Hosp, Univ Copenhagen Hosp, Dept Fetal Ultrasound, Hvidovre, Denmark