1. Department of Orthopaedic Surgery, TRIA Orthopaedic Center, Bloomington, MN, USA
2. Department of Orthopaedic Surgery, Park Nicollet Methodist Hospital, St. Louis Park, MN, USA
3. Department of Orthopaedic Surgery, University of Texas Southwestern Medical Center, Dallas, TX, USA
4. Department of Orthopaedic Surgery, University of Minnesota, Minneapolis, MN, USA