1. NorthShore University HealthSystem, Skokie, Illinois;
2. Feinberg School of Medicine, Northwestern University, Chicago, Illinois;
3. Emory Sports Medicine Center, Johns Creek, Georgia;
4. Emory University School of Medicine, Atlanta, Georgia;
5. Ann & Robert H. Lurie Children's Hospital of Chicago, Chicago, Illinois;
6. Boston Children's Hospital, Boston, Massachusetts;
7. Harvard Medical School, Boston, Massachusetts; and
8. Rollins School of Public Health, Emory University, Atlanta, Georgia.