1. Rothman Orthopaedic Institute, Thomas Jefferson University Hospital, Philadelphia, PA, USA
2. Department of Orthopaedic Surgery, University of Michigan Health System, Ann Arbor, MI, USA
3. School of Medicine, Virginia Commonwealth University, Richmond, VA, USA
4. Cedars-Sinai Orthopaedic Center, Los Angeles, CA, USA
5. School of Medicine, University of South Carolina, Columbia, SC, USA