1. Division of Maternal–Fetal Medicine, Department of Obstetrics, Gynecology and Reproductive Sciences UTHealth The University of Texas McGovern Medical School and the Fetal Center at Children's Memorial Hermann Hospital Houston TX USA
2. Johns Hopkins Center for Fetal Therapy, Department of Gynecology and Obstetrics Johns Hopkins University School of Medicine Baltimore MD USA
3. Department of Obstetrics and Gynecology University of Colorado Denver, Colorado Fetal Care Center, Children's Hospital of Colorado Denver CO USA
4. Cincinnati Children's Fetal Care Center Cincinnati OH USA
5. Midwest Fetal Care Center Children's Minnesota Minneapolis MN USA
6. The Biostatistics Center George Washington University Rockville MD USA