1. Department of Otorhinolaryngology – Head & Neck Surgery University of Pennsylvania Philadelphia Pennsylvania U.S.A.
2. Department of Otolaryngology – Head & Neck Surgery University of South Florida Tampa Florida U.S.A.
3. Department of Otolaryngology – Head & Neck Surgery Mount Sinai School of Medicine New York New York U.S.A.
4. Department of Radiology, Division of Neuroradiology University of Pennsylvania Philadelphia Pennsylvania U.S.A.
5. Department of Neurosurgery University of Pennsylvania Philadelphia Pennsylvania U.S.A.
6. Division of Neurosurgery Children's Hospital of Philadelphia Philadelphia Pennsylvania U.S.A.