1. Department of Orthopaedic Surgery, Westchester Medical Center, Valhalla, New York, USA.
2. Department of Orthopaedics, The Ohio State University Wexner Medical Center, Columbus, Ohio, USA.
3. Department of Orthopaedic Surgery, Wake Forest University Baptist Medical Center, Valhalla, Winston-Salem, North Carolina, USA.
4. Department of Orthopaedic Surgery, The Rothman Institute, Philadelphia, Pennsylvania, USA.
5. Midwest Orthopaedics at Rush, Rush University Medical Center, Chicago, Illinois, USA.