The University of Western Australia - Fiona Stanley Hospital, Johns Hopkins University, Department of Neurology, Donders Institute for Brain, Cognition and Behaviour, University of Lausanne - Lausanne University Hospital, University of Siena, Copenhagen University - Center for Rheumatology and Spine Diseases, affiliation not provided to SSRN, Dokkyo Medical University, affiliation not provided to SSRN, University of Leeds - Leeds Institute of Rheumatic and Musculoskeletal Medicine, University of Barcelona, Charité - Universitätsmedizin Berlin - Department of Rheumatology and Clinical Immunology, affiliation not provided to SSRN, University of Pittsburgh, University of Pisa, University of Leeds - Leeds Institute of Rheumatic and Musculoskeletal Medicine, University of Leeds, The University of Western Australia - Fiona Stanley Hospital, Medical University of Vienna, Rigshospitalet - Copenhagen Centre for Arthritis Research and Catholic University of the Sacred Heart of Milan