1. Department of Orthopaedics and Traumatology, University General Hospital Reina Sofía, Avda Intendente Jorge Palacios 1, Murcia 30003, Spain
2. Regional Statistical Center, Treasury and public administration council, Murcia, Spain
3. Department of Orthopaedics and Traumatology, University General Hospital Reina Sofía, Murcia, Spain