[1] Univ Hosp Gasthuisberg, Woman & Child Div, Fetal Med Unit, B-3000 Louvain, Belgium
[2] Hosp Clin Barcelona, Dept Obstet, Barcelona, Spain
[3] Kings Coll Hosp London, Harris Birthright Ctr Fetal Med, London, England
[4] Univ Hosp Gasthuisberg, Div Med Imaging, B-3000 Louvain, Belgium
[5] Sophia Childrens Univ Hosp, Erasmus Med Ctr, Dept Intens Care, Rotterdam, Netherlands
[6] Sophia Childrens Univ Hosp, Erasmus Med Ctr, Dept Pediat Surg, Rotterdam, Netherlands