1. Department of Otolaryngology, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania
2. Department of Pathology, Southern California Permanente Medical Group, Woodland Hills
3. Division of Anatomic Pathology, Department of Pathology, The University of Alabama at Birmingham4Now with the Department of Pathology and Anatomical Sciences, State University of New York at the University at Buffalo and Erie County Medical Center, Buffal
4. Department of Otorhinolaryngology–Head and Neck Surgery, University of Göttingen, Göttingen, Germany
5. Department of Pathology and Laboratory Medicine, The Ottawa Hospital/University of Ottawa, Ottawa, Ontario, Canada
6. Department of Pathology, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania
7. Biostatistics Facility, University of Pittsburgh Cancer Institute, Pittsburgh, Pennsylvania
8. Department of Surgery, Head and Neck Oncology, The University of Alabama at Birmingham
9. Department of Otolaryngology, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania10Department of Otolaryngology, Veterans Affairs of Pittsburgh Health System, Pittsburgh, Pennsylvania