1. Department of Orthopaedics, The University of Alabama at Birmingham, Birmingham, Alabama
2. Clinic of Orthopedics and Pediatric Orthopedics, Medical University of Lodz, Lodz, Lodzkie, Poland
3. Department of Orthopaedic Surgery, University of Missouri Columbia, Missouri Orthopaedic Institute, Columbia, Missouri
4. Department of Thompson Laboratory for Regenerative Orthopaedics, University of Missouri Columbia, Missouri Orthopaedic Institute, Columbia, Missouri
5. Department of Orthopaedics, Hughston Clinic, Columbus, Georgia