1. Department of Otolaryngology-Head and Neck Surgery, University of California San Diego, La Jolla, California, United States of America
2. Veterans Administration Medical Center and Department of Pathology, University of California San Diego, La Jolla, California, United States of America
3. Department of Otolaryngology-Head and Neck Surgery, University of California San Francisco, San Francisco, California, United States of America
4. Department of Pediatrics, University of California San Diego, La Jolla, California, United States of America
5. Department of Medicine and Moores Cancer Center, University of California San Diego, La Jolla, California, United States of America
6. Department of Surgery, The University of Hong Kong, Pokfulam, Hong Kong, China