1. Caruso Department of Otolaryngology – Head and Neck Surgery, Keck School of Medicine University of Southern California Los Angeles California U.S.A.
2. Division of Laryngology, Department of Otolaryngology – Head & Neck Surgery University of South Florida Tampa Florida U.S.A.
3. Department of Otolaryngology – Head and Neck Surgery, Feinberg School of Medicine Northwestern University Chicago Illinois U.S.A.
4. Southern California Permanente Medical Group, Kaiser Permanente Baldwin Park Baldwin Park California U.S.A.
5. Department of Otolaryngology Vanderbilt University Medical Center Nashville Tennessee U.S.A.