1 Department of Otolaryngology/Head and Neck Surgery, University of Washington, Seattle, WA, USA. Electronic address: kzenner@uw.edu.
2 Department of Otolaryngology/Head and Neck Surgery, University of Washington, Seattle, WA, USA; Division of Pediatric Otolaryngology, Seattle Children's Hospital, Seattle, WA, USA.
3 Department of Laboratories, Seattle Children's Hospital, Seattle, WA, USA.