1. Perelman School of Medicine; University of Pennsylvania; Philadelphia Pennsylvania USA
2. Center for Fetal Diagnosis and Treatment, Children's Hospital of Philadelphia; Philadelphia Pennsylvania USA
3. Department of Radiology; Children's Hospital of Philadelphia; Philadelphia Pennsylvania USA
4. Department of Radiology; Hospital of the University of Pennsylvania; Philadelphia Pennsylvania USA
5. Department of Surgery; Children's Hospital of Philadelphia; Philadelphia Pennsylvania USA
6. Department of Pathology; Children's Hospital of Philadelphia; Philadelphia Pennsylvania USA