1. Depatment of Pathology; University of Pittsburgh Medical Center; Pittsburgh Pennsylvania
2. Department of Pathology; Southern California Permanente Medical Group; Woodland Hills California
3. Department of Pathology; University Health Network; Toronto Ontario Canada
4. Department of Medicine; University of Pittsburgh Medical Center; Pittsburgh Pennsylvania
5. Division of Head and Neck Surgery; Department of Otolaryngology; University of Pittsburgh Cancer Institute; Pittsburgh Pennsylvania
6. Biostatistics Facility; University of Pittsburgh Cancer Institute; Pittsburgh Pennsylvania