1 Baylor College of Medicine, Department of Obstetrics and Gynecology, Texas Children's Hospital Fetal Center, 6651 Main Street, Houston, TX, 77030, USA.
2 Baylor College of Medicine, Department Neurosurgery, Texas Children's Hospital Fetal Center, Houston, TX, USA.
3 Department of Obstetrics and Gynecology, St Marks Hospital, Salt Lake City, UT, USA.
4 Department of Obstetrics and Gynecology, University of Utah, Salt Lake City, UT, USA.
5 Baylor College of Medicine, Department of Anesthesiology, Texas Children's Hospital Fetal Center, Houston, TX, USA.
6 Department of Obstetrics and Gynecology, Weill-Cornell Medical College, New York, NY, USA.