1. From the Department of Otolaryngology–Head and Neck Surgery, Stanford University School of Medicine, Stanford, Calif.
2. Division of Pediatric Otolaryngology, Department of Otolaryngology–Head and Neck Surgery, Stanford University Medical Center, Stanford, Calif.
3. Department of Otolaryngology–Head and Neck Surgery, Cathay General Hospital, Taipei, Taiwan
4. Department of Otolaryngology–Head and Neck Surgery, University of Miami, Miller School of Medicine, Miami, Fla.