1 Drexel University College of Medicine, Philadelphia, PA.
2 Department of Otolaryngology-Head and Neck Surgery, University of Minnesota, Minneapolis, MN.
3 Department of Otolaryngology-Head and Neck Surgery, Valegos College of Physicians and Surgeons, NewYork-Presbyterian/Columbia University Irving Medical Center, New York, NY.
4 Division of Pediatric Otolaryngology, Children's Hospital of Philadelphia, Philadelphia, PA.
5 Department of Otorhinolaryngology/Head and Neck Surgery, University of Pennsylvania, Philadelphia, PA.
6 Department of Otolaryngology-Head and Neck Surgery, Massachusetts Eye and Ear, Harvard Medical School, Boston, MA.
7 Department of Otolaryngology-Head and Neck Surgery, Vanderbilt University Medical Center, Nashville, TN.