| Affiliation: | 1. Department of Biostatistics and Epidemiology, Center for Clinical Epidemiology and Biostatistics, University of Pennsylvania, Perelman School of Medicine, Philadelphia, PA;2. Department of Otorhinolaryngology–Head and Neck Surgery, University of Pennsylvania, Perelman School of Medicine, Philadelphia, PA;3. Department of Surgery, University of Arizona, Tucson, AZ;4. Philadelphia Veterans Affairs Medical Center, Philadelphia, PA;5. Division of Infectious Diseases, Department of Medicine, University of Pennsylvania, Perelman School of Medicine, Philadelphia, PA |
