1. Department of Otolaryngology; University of Pittsburgh Medical Center; Pittsburgh Pennsylvania
2. Department of Otolaryngology; Loma Linda Medical Center; Loma Linda California U.S.A
3. Department of Biostatistics; University of Pittsburgh Cancer Institute; Pittsburgh Pennsylvania
4. Department of Pathology; University of Pittsburgh Medical Center; Pittsburgh Pennsylvania
5. Department of Otolaryngology; VA Pittsburgh Health System; University of Pittsburgh Medical Center; Pittsburgh Pennsylvania