Affiliation: | 1. Department of Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas;2. Houston Veterans Affairs Health Services Research and Development Center, Michael E. DeBakey Veterans Affairs Medical Center, Houston, Texas;3. Bobby R. Alford Department of Otolaryngology Head and Neck Surgery, Baylor College of Medicine, Houston, Texas;4. Department of Pathology and Immunology, Baylor College of Medicine, Houston, Texas;5. Department of Pathology, Michael E. DeBakey Veterans Affairs Medical Center, Houston, Texas;6. Department of Internal Medicine, The University of Texas Health Science Center at Houston, Houston, Texas |