1. Meram Faculty of Medicine, Department of Orthopaedic Surgery, Konya Selcuk University, Konya, Turkey
2. Department of Orthopaedic Surgery, University of Michigan, 2098 South Main St., Ann Arbor, MI 48103, USA
3. Bay Pines VA Health Care System, Bay Pines, FL, USA
4. Denver Health Medical Center, Department of Orthopedic Surgery, University of Colorado Denver, Denver, CO, USA