1. Perelman School of MedicineUniversity of Pennsylvania Philadelphia Pennsylvania USA
2. Center for Fetal Diagnosis and TreatmentChildren's Hospital of Philadelphia Philadelphia Pennsylvania USA
3. Department of RadiologyChildren's Hospital of Philadelphia Philadelphia Pennsylvania USA
4. Department of RadiologyHospital of the University of Pennsylvania Philadelphia Pennsylvania USA
5. Department of PathologyChildren's Hospital of Philadelphia Philadelphia Pennsylvania USA
6. Department of SurgeryChildren's Hospital of Philadelphia Philadelphia Pennsylvania USA