1. Department of Epidemiology, University of Colorado – Anschutz Medical Campus, Aurora, CO, USA
2. Center for Outcomes-based Orthopaedic Research, Steadman Philippon Research Institute, Vail, CO, USA
3. Department of Exercise and Sport Science, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
4. Department of Biostatistics and Informatics, University of Colorado – Anschutz Medical Campus, Aurora, CO, USA
5. Department of Pediatrics, University of Colorado School of Medicine, Aurora, CO, USA
6. Department of Family Medicine, University of Colorado School of Medicine, Denver, CO, USA