1. The Micheli Center for Sports Injury Prevention, Waltham, MA, USA
2. Division of Sports Medicine, Department of Orthopedics, Boston Children’s Hospital, Waltham, MA, USA
3. Department of Orthopaedic Surgery, Harvard Medical School, Boston, MA, USA
4. Division of Cardiovascular Medicine, Department of Medicine, Thomas Jefferson University Hospitals, Philadelphia, PA, USA
5. Department of Surgery, Sidney Kimmel Medical College at Thomas Jefferson University, Philadelphia, PA, USA