1. Department of Otolaryngology; Vanderbilt Voice Center, Vanderbilt University Medical Center; Nashville Tennessee U.S.A
2. Center for Surgical Quality and Outcomes Research, Institute for Medicine and Public Health, Vanderbilt University Medical Center; Nashville Tennessee U.S.A
3. Vanderbilt University School of Medicine, Vanderbilt University Medical Center; Nashville Tennessee U.S.A
4. Division of Laryngology; Department of Otolaryngology-Head & Neck Surgery; University of Washington; Seattle Washington U.S.A
5. Department of Urological Surgery; Vanderbilt University Medical Center; Nashville Tennessee U.S.A
6. Geriatric Research Education and Clinical Center, Veterans Administration Tennessee Valley Healthcare System; Nashville Tennessee U.S.A