1. Department of Otolaryngology – Head & Neck Surgery Thomas Jefferson University Philadelphia Pennsylvania USA
2. Department of Otolaryngology—Head & Neck Surgery University of North Carolina Chapel Hill North Carolina USA
3. Division of Rhinology and Skull Base Surgery Department of Otolaryngology – Head & Neck Surgery Mayo Clinic Rochester Minnesota USA
4. Department of Otolaryngology – Head & Neck Surgery University of Pittsburgh Medical Center Pittsburgh Pennsylvania USA
5. Department of Neurological Surgery Thomas Jefferson University Philadelphia Pennsylvania USA