1. Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
2. Department of Orthopaedic Surgery, University of Connecticut, Farmington, CT, USA
3. Department of Orthopaedic Surgery, Columbia University Medical Center, New York, NY, USA
4. Department of Orthopaedic Surgery, Boston University School of Medicine, Boston, MA, USA
5. Department of Orthopaedic Surgery and Sports Medicine, University of Pennsylvania, Philadelphia, PA, USA
6. Department of Orthopaedic Surgery and Sports Medicine, Mount Sinai, New York, NY, USA