1. Department of Otolaryngology; Wake Forest School of Medicine; Winston-Salem North Carolina U.S.A.
2. Department of Cardiology; University of Pittsburgh Medical Center-Mercy Division; Pittsburgh Pennsylvania U.S.A.
3. Department of Anesthesiology; University of Pittsburgh Medical Center
4. Department of Otolaryngology; University of Pittsburgh Medical Center; Pittsburgh Pennsylvania U.S.A.
5. Department of Otolaryngology; Mayo Clinic; Scottsdale Arizona U.S.A.
6. Department of Otolaryngology; Cleveland Clinic; Cleveland Ohio U.S.A.
7. Department of Otolaryngology; University of Colorado; Denver Colorado U.S.A.
8. Department of Otolaryngology; University of California-San Diego; San Diego California U.S.A.
9. Department of Otolaryngology; Medical College of Wisconsin; Milwaukee Wisconsin U.S.A.