1. Department of Otorhinolaryngology—Head and Neck SurgeryUniversity of Pennsylvania Philadelphia Pennsylvania USA
2. Department of Otolaryngology—Head and Neck Surgery, Medical College of GeorgiaAugusta University Augusta Georgia USA
3. Department of Otolaryngology—Head and Neck SurgeryUniversity of Miami Miami Florida USA
4. Department of Otolaryngology—Head and Neck SurgeryNorthwestern University Chicago Illinois USA
5. Department of Otolaryngology—Head and Neck SurgeryScripps Memorial San Diego California USA
6. Department of Otolaryngology—Head and Neck SurgeryUniversity of Kansas Kansas City Kansas USA