1. School of Medicine, Virginia Commonwealth University, Richmond, VA, USA
2. Department of Orthopaedic Surgery, Penn State Hershey Bone and Joint Institute, Penn State Milton S. Hershey Medical Center, Hershey, PA, USA
3. School of Medicine, University of South Carolina, Columbia, SC, USA
4. Cedars-Sinai Orthopaedic Center, Los Angeles, CA, USA