1. Veterans Affairs Pittsburgh Health System; Pittsburgh Pennsylvania U.S.A
2. Department of Surgery; Division of Otolaryngology; Department of Otolaryngology; University of Pittsburgh Medical Center; Pittsburgh Pennsylvania U.S.A
3. Department of Radiology; Division of Nuclear Medicine; University of Pittsburgh Medical Center; Pittsburgh Pennsylvania U.S.A
4. Department of Otolaryngology-Head and Neck Surgery; University of Toronto; Toronto Canada