1 Centre for Fetal Care, Queen Charlotte's and Chelsea Hospital, Imperial College Healthcare NHS Trust, London, United Kingdom, and Department of Obstetrics and Gynecology, University of Parma, Parma, Italy.
2 Centre for Fetal Care, Queen Charlotte's and Chelsea Hospital, Imperial College Healthcare NHS Trust, and Department of Surgery and Cancer, Imperial College London, London, United Kingdom, and Department of Development and Regeneration, KU Leuven, Leuven, Belgium.