1. Department of Otolaryngology/Head and Neck Surgery, Southern California Permanente Medical Group, San Diego, California, USA
2. Regional Offices, Department of Research and Evaluation, Southern California Permanente Medical Group, Pasadena, California, USA
3. Division of Otolaryngology/Head and Neck Surgery, University of California–San Diego, San Diego, California, USA
4. Department Emergency Medicine, Southern California Permanente Medical Group, San Diego, California, USA