1. USC Voice Center, Department of Otolaryngology–Head & Neck Surgery University of Southern California Los Angeles California U.S.A.
2. Department of Otolaryngology Head and Neck Surgery Keck School of Medicine of the University of Southern California Los Angeles California U.S.A.
3. Department of Otolaryngology–Head & Neck Surgery University of Washington School of Medicine Seattle Washington U.S.A.
4. USF Health Voice Center, Department of Otolaryngology – Head & Neck Surgery University of South Florida Tampa Florida USA
5. Department of Head and Neck Surgery David Geffen School of Medicine at the University of California Los Angeles California U.S.A.
6. Division of Head and Neck Surgery David Geffen School of Medicine at the University of California Los Angeles California U.S.A.