1. Wake Forest School of Medicine Winston‐Salem North Carolina U.S.A.
2. Department of Otolaryngology‐Head and Neck Surgery University of California‐San Francisco Voice and Swallowing Center San Francisco California U.S.A.
3. University of California‐Davis School of Medicine Sacramento California U.S.A.
4. Department of Otolaryngology‐Head and Neck Surgery University of California‐Davis School of Medicine Sacramento California U.S.A.
5. Department of Otolaryngology‐Head and Neck Surgery Wake Forest School of Medicine Winston‐Salem North Carolina U.S.A.