1. AO Research Institute Davos, Davos, Switzerland
2. Clinic of General Orthopaedics and Tumor Orthopaedics, University Hospital Muenster, Münster, Germany
3. Department of Orthopedics and Traumatology, Hospital Alma Mater de Antioquia, Medellín, Colombia
4. Department of Orthopedics and Traumatology, Universidad Pontificia Bolivariana, Medellín, Colombia