1. Department of Obstetrics and Gynecology Baylor College of Medicine and Texas Children's Hospital Houston TX USA
2. Department of Obstetrics and Gynecology University Paris Descartes, Hopital Necker–Enfants Malades Paris France
3. Department of Maternal–Fetal Medicine Osaka Medical Center and Research Institute for Maternal and Child Health Izumi Japan
4. Department of Obstetrics and Gynecology, Los Angeles Fetal Surgery, Keck School of Medicine University of Southern California Los Angeles CA USA