1. Maywood and Hinsdale, Illinois; Cleveland, Ohio; Los Angeles, California; Naples, Florida; Augusta, Georgia; and Singapore
2. Department of Otolaryngology, Loyola University Medical Center, Maywood, IL (Dr Walker)
3. Hinsdale Hospital, Hinsdale, IL (Dr Walker)
4. Cleveland Nasal Sinus and Sleep Center, Head and Neck Institute, Marymount Outpatient Care Center, Cleveland Clinic Foundation, Cleveland, OH (Dr Levine)
5. Cedars-Sinai Medical Center, Los Angeles, CA (Dr Hopp)
6. Cleveland Clinic Florida, Naples, FL (Dr Green)
7. Department of Otolaryngology, Medical College of Georgia, Augusta, GA (Dr Pang)
8. Tan Tock Seng Hospital, Singapore (Dr Pang).