1. Department of Orthopaedic Surgery, The Warren Alpert School of Medicine, Brown University, Providence, RI, USA
2. Miller Orthopedic Specialists, Council Bluffs, IA, USA
3. Miller Orthopedic Specialists, Omaha, NE, USA
4. Department of Orthopaedic Surgery, Missouri Orthopaedic Institute, University of Missouri, Columbia, MO, USA