1. Center for Outcomes-Based Orthopaedic Research, Steadman Philippon Research Institute , 181 W Meadow Dr, Ste 1000, Vail, CO 81657, USA
2. Steadman Clinic and United States Coalition for the Prevention of Illness and Injury in Sport , 181 W Meadow Dr, Ste 400, Vail, CO 81657, USA