1. Department of Head and Neck Surgery, University of California-Los Angeles, 10833 Le Conte Avenue 62-132 CHS, Los Angeles, CA 90095, USA
2. Department of Otolaryngology-Head and Neck Surgery, Walter Reed Army Medical Center, Washington, DC, USA
3. Department of Surgery, Division of Head and Neck Surgery, San Antonio Military Medical Center, Fort Sam Houston, TX 78234-6200, USA