1. Greenberg Center for Skeletal Dysplasias, Department Genetic of Medicine Johns Hopkins University School of Medicine Baltimore Maryland USA
2. Genome Medical Services San Francisco California USA
3. Division of Maternal Fetal Medicine, Department of Gynecology and Obstetrics Johns Hopkins University School of Medicine Baltimore Maryland USA
4. JunoDx San Diego California USA
5. Center for Maternal and Fetal Medicine Howard County General Hospital, Johns Hopkins Hospital Baltimore Maryland USA
6. Center for Fetal Therapy Johns Hopkins University School of Medicine Baltimore Maryland USA
7. Sibley Memorial Hospital Maternal Fetal Medicine Washington District of Columbia USA