1. Department of Orthopaedic Surgery, UPMC Freddie Fu Sports Medicine Center, University of Pittsburgh, Pittsburgh, Pennsylvania, USA
2. Central Maine Healthcare Orthopedics, Central Maine Medical Center, Lewiston, Maine, USA
3. School of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania, USA
4. Department of Orthopaedics, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
5. School of Health and Rehabilitation Sciences, University of Pittsburgh, Pittsburgh, Pennsylvania, USA