1. Department of Orthopedic Surgery, Rady Children's Hospital, San Diego, California, USA; University of California, San Diego, San Diego, California, USA
2. Investigation performed at Rady Children’s Hospital, San Diego, California, USA
3. Department of Orthopedic Surgery, Rady Children's Hospital, San Diego, California, USA
4. Department of Orthopedic Surgery, Boston Children's Hospital, Boston, Massachusetts, USA
5. Children’s Healthcare of Atlanta, Atlanta, Georgia, USA
6. Texas Scottish Rite Hospital for Children, Dallas, Texas, USA
7. Division of Sports Medicine, Boston Children's Hospital, Boston, Massachusetts, USA
8. C.S. Mott Children's Hospital, Ann Arbor, Michigan, USA
9. Department of Orthopaedic Surgery, Washington University in Saint Louis, Saint Louis, Missouri, USA
10. UCSF Benioff Children’s Hospital, Oakland, California, USA
11. Department of Orthopaedic Surgery, Campbell Clinic, Memphis, Tennessee, USA