1. ABC Medical School; Discipline of Orthopaedic Surgery and Traumatology / Spine Surgery Group; 321 Dr. Henrique Calderazzo ST 5th Floor São Paulo Brazil 09190-615
2. Universidade Federal de São Paulo; Department of Orthopaedics and Traumatology; Rua das Rosas, 126 apto 73 São Paulo Brazil
3. Thomas Jefferson University; Rothman Institute, Department of Orthopedic Surgery; 2500 English Creek Avenue Egg Harbor NJ USA 08234
4. Kobe University Graduate School of Medicine; Department of Orthopaedic Surgery; 7-5-1 Kusunoki-cho, Chuo-ku Kobe Japan 650-0017
5. University of Pittsburgh Medical Center; Orthopaedic Department; Pittsburgh PA USA