1. University of Pittsburgh School of Medicine Pittsburgh Pennsylvania USA
2. Department of Otolaryngology – Head & Neck Surgery University of Toronto, St. Michael's Hospital Toronto Ontario Canada
3. UCSF Voice and Swallowing Center, Division of Laryngology, Department of Otolaryngology – Head & Neck Surgery University of California San Francisco San Francisco California USA
4. Department of Physical Medicine and Rehabilitation University of Pittsburgh School of Medicine Pittsburgh Pennsylvania USA
5. Department of Otolaryngology, University of Pittsburgh Voice Center University of Pittsburgh Medical Center Pittsburgh Pennsylvania USA