1. Walter Reed National Military Medical Center, Bethesda, Maryland, USA
2. Harvard Medical School, Boston, Massachusetts, USA
3. University of Pittsburgh/Children’s Hospital of Pittsburgh of UMPC, Pittsburgh, Pennsylvania, USA
4. David Geffen School of Medicine at University of California Los Angeles, Los Angeles, California, USA
5. University of Washington/Seattle Children’s Hospital, Seattle, Washington, USA
6. Children’s National Medical Center, Washington, DC, USA
7. University of Colorado/Children’s Hospital Colorado, Aurora, Colorado, USA
8. West Virginia University, Morgantown, West Virginia, USA
9. University of Texas–Southwestern Medical Center/Children’s Medical Center-Dallas, Dallas, Texas, USA
10. American Academy of Otolaryngology—Head and Neck Surgery Foundation, Alexandria, Virginia, USA
11. SUNY Downstate Medical Center, Brooklyn, New York, USA