1. University of Pittsburgh Voice Center, Department of Otolaryngology; University of Pittsburgh School of Medicine; UPMC Mercy Building B, Suite 11500, 1400 Locust Street Pittsburgh Pennsylvania 15219 USA
2. Department of Otolaryngology; Loma Linda University; Loma Linda California USA
3. Heart and Vascular Institute; University of Pittsburgh School of Medicine; Pittsburgh Pennsylvania USA
4. Department of Physical Medicine and Rehabilitation; University of Pittsburgh School of Medicine; Pittsburgh Pennsylvania USA