Zao Yang1, Ravindra Uppaluri2, James S Lewis3. 1. Department of Otolaryngology-Head and Neck Surgery, Louisiana State University Health Sciences Center, Shreveport. 2. Department of Otolaryngology-Head and Neck Surgery, Washington University School of Medicine, St Louis, Missouri. 3. Department of Otolaryngology-Head and Neck Surgery, Washington University School of Medicine, St Louis, Missouri3Department of Pathology and Immunology, Washington University School of Medicine, St Louis, Missouri.