1. Department of Otolaryngology, Massachusetts Eye and Ear Infirmary, Boston, Massachusetts;
2. Departments of Otology and Laryngology and
3. Pediatric Sleep Associates and
4. Pediatrics, Harvard Medical School, Boston, Massachusetts;
5. Down Syndrome Program, Division of Medical Genetics, Department of Pediatrics, Massachusetts General Hospital, Boston, Massachusetts; and
6. Department of Otolaryngology, University of Pittsburgh, Pittsburgh, Pennsylvania