1. Department of Orthopaedic Surgery, Hospital of University of Pennsylvania, Philadelphia, Pennsylvania
2. Department of Orthopaedic Surgery, Aurora Healthcare, Sheboygan, Wisconsin
3. Department of Orthopaedic Surgery, Fillmore County Hospital, Geneva, Nebraska, Switzerland
4. Trinity Health, Livonia, Michigan
5. Department of Orthopaedic Surgery, Cleveland Clinic, Cleveland, Ohio