1. Department of Orthopedics, Hospital Regional de Talca, Talca, Region del Maule, Chile
2. Associate Professor, Universidad Católica del Maule, Talca, Chile
3. Department of Orthopedics, Clinica Alemana, Santiago, Chile,
4. Department of Orthopaedic Surgery and Traumatology, UHC Santiago de Compostela, Praza do Obradoiro, Santiago de Compostela, La Coruña, Spain,
5. Department of Orthopedics, Hospital Universitario Evangélico Mackenzie de Curitiba, Curitiba, Brazil.