1. Department of Otolaryngology, University of Minnesota, Minneapolis
2. Geisel School of Medicine at Dartmouth, Veterans Affairs Outcomes Group, White River Junction, Vermont
3. Department of Otolaryngology, University of Illinois–Chicago, Chicago
4. Children’s Hospital of the King’s Daughters, Norfolk, Virginia
5. Department of Otorhinolaryngology, Ochsner Clinic Foundation, New Orleans, Louisiana
6. Department of Otolaryngology–Head and Neck Surgery, Washington University School of Medicine in St Louis, St Louis, Missouri