1. Department of Trauma and Orthopaedic Surgery, Hospital, Universitari Mútua Terrassa, Terrassa, Barcelona, Spain
2. Universidad Autònoma de Barcelona (UAB), Bellaterra, Barcelona, Spain
3. Department of Trauma and Orthopaedic Surgery, Hospital Althaia Manresa. Manresa, Barcelona, Spain
4. Department of Trauma and Orthopaedic Surgery, Hospital Nostra Senyora de Meritxell, Andorra
5. Department of Trauma and Orthopaedic Surgery, Hospital Clínico Universitario de Valladolid. Valladolid, Spain
6. Universidad de Valladolid, Valladolid, Spain
7. Department of Trauma and Orthopaedic Surgery, Hospital Universitario 12 de Octubre, Madrid, Spain