1. Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
2. Foot and Ankle Injury Research (FAIR) Group, Division of Foot and Ankle Surgery, Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
3. Department of Orthopaedics, Cedars-Sinai Medical Center, Los Angeles, CA, USA
4. The Orthopedic Institute of Wisconsin, Franklin, WI, USA
5. Southern California Orthopedic Institute, Los Angeles, CA, USA
6. Hospital for Special Surgery, New York, NY, USA