1. Department of Orthopaedic Surgery, Rush University Medical Center, Chicago, Illinois
2. Department of Orthopaedics and Traumatology, Hospital Clínic de Barcelona, Barcelona, Spain
3. Department of Orthopaedics and Traumatology, Escola Paulista de Medicina, Federal University of São Paulo, São Paulo, Brazil
4. Department of Radiology, HIMAN Barrio Norte, Buenos Aires, Argentina