1. Department of Otolaryngology Thomas Jefferson University Philadelphia Pennsylvania USA
2. Department of Otolaryngology and Communication SUNY Upstate Medical University Syracuse New York USA
3. Department of Otolarynology – Head & Neck Surgery University of Ottawa Ottawa Ontario USA
4. Perelman School of Medicine, University of Pennsylvania Philadelphia Pennsylvania USA
5. Department of Otorhinolarynoglogy – Head & Neck Surgery University of Pennsylvania Philadelphia Pennsylvania USA
6. Corporal Michael J. Crescenz VA Medical Center Philadelphia Pennsylvania USA