Affiliation: | 1. Department of Orthopaedic Surgery and Traumatology, Kantonsspital St. Gallen, St. Gallen, Switzerland;2. Innsbruck Institute of Patient-centered Outcome Research (IIPCOR), Innsbruck, Austria;1. Department of Orthopaedic Surgery, Cliniques Universitaires Saint Luc, Brussels, Belgium;2. Department of Rheumatology, Pôle de Rhumatologie, Institut de Recherche Expérimentale et Clinique, Université catholique de Louvain et Cliniques Universitaires Saint Luc, Brussels, Belgium |