1. Department of Orthopaedic Surgery and Rehabilitation, Texas Tech University Health Sciences Center, El Paso, Texas, USA
2. Department of Orthopaedics and Rehabilitation, Texas Tech University Health Sciences Center, Lubbock, Texas, USA
3. Department of Orthopedic Surgery and Traumatology, Niguarda Hospital, Milan, Italy
4. Department of Economics, Applied Statistics and International Business, New Mexico State University, Las Cruces, New Mexico, USA
5. Department of Orthopedic Surgery and Traumatology, Menaggio Hospital, Como, Italy
6. Department of Orthopaedic Surgery, Maimonides Medical Center, Brookyln, New York, USA
7. Department of Orthopaedics and Rehabilitation, University of New Mexico, Albuquerque, New Mexico, USA
8. Department of Orthopedic Surgery, Tanta University Hospital, Faculty of Medicine, Tanta University, Tanta, Egypt