1. North Carolina Orthopaedic Clinic, Division of Orthopaedic
Surgery, and Fuqua Business School, Duke University, Durham, North Carolina,
2. Division of Orthopaedic Surgery, Duke University Medical
Center, Durham, North Carolina
3. Department of Orthopaedic Surgery, Saint Louis University
School of Medicine/St Johns Mercy Medical Center, St Louis, Missouri
4. Department of Orthopaedic Surgery, University of Pennsylvania
School of Medicine, Philadelphia
5. Department of Orthopaedic Surgery, University of Pennsylvania
School of Medicine, and Pennsylvania Hospital, Philadelphia