Affiliation: | 1. Department of Orthopaedic Surgery and Traumatology, Hospital Universitario Fundación Jiménez Diaz, FJD Health Research Institute, Madrid, Spain;2. Clinical Research Unit, Hospital Universitario Fundación Jiménez Diaz, FJD Health Research Institute, Madrid, Spain;3. Department of Statistics, Hospital Universitario Fundación Jiménez Diaz, FJD Health Research Institute, Madrid, Spain |