1. Department of Otolaryngology University of Pittsburgh Medical Center Pittsburgh Pennsylvania
2. Department of Pathology Southern California Permanente Medical Group Woodland Hills California
3. Department of Pathology and Laboratory Medicine The Ottawa Hospital, University of Ottawa Ottawa Ontario Canada
4. Department of Pathology Cleveland Clinic Cleveland Ohio
5. Section of Head and Neck Surgery and Oncology, Head and Neck Institute Cleveland Clinic Cleveland Ohio
6. Department of Pathology Thomas Jefferson University Philadelphia Pennsylvania
7. Department of Otolaryngology–Head and Neck Surgery Thomas Jefferson University Philadelphia Pennsylvania
8. Department of Pathology Sunnybrook Health Sciences Centre Toronto Ontario Canada
9. Department of Otolaryngology–Head and Neck Surgery Sunnybrook Health Sciences Centre Toronto Ontario Canada
10. Department of Anatomic Pathology Moffitt Cancer Center Tampa Florida
11. Department of Pathology Icahn School of Medicine at Mount Sinai New York New York
12. Department of Pathology Tan Tock Seng Hospital Singapore
13. Biostatistics Facility UPMC Hillman Cancer Center Pittsburgh Pennsylvania
14. Department of Pathology University of Pittsburgh Medical Center Pittsburgh Pennsylvania