[1] Leiden Univ, Med Ctr, Dept Pediat, Div Neonatol & Gastroenterol, Leiden, Netherlands
[2] Leiden Univ, Med Ctr, Dept Obstet, Div Fetal Med, Leiden, Netherlands
[3] Univ Louvain, Med Ctr, Dept Obstet, Div Fetal Med, Louvain, Belgium
[4] Chicago Res Ctr, Lurie Childrens Hosp, Dept Pediat, Chicago, IL USA