1. Institute for Sports Medicine, Ann & Robert H. Lurie Children’s Hospital of Chicago, Chicago, Illinois;
2. Department of Pediatrics, University of Washington, Seattle, Washington;
3. Department of Pediatrics, Geisinger Commonwealth School of Medicine, Scranton, Pennsylvania;
4. Department of Pediatrics, Milton S. Hershey College of Medicine, Pennsylvania State University, Hershey, Pennsylvania; and
5. Central Pennsylvania Clinic for Special Children and Adults, Belleville, Pennsylvania