affiliation not provided to SSRN, Copenhagen Center for Arthritis Research (COPECARE) - Center for Rheumatology and Spine Diseases, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, Karolinska Institutet - Clinical Epidemiology Division, Diakonhjemmet Hospital, Karolinska Institutet - Clinical Epidemiology Division, affiliation not provided to SSRN, Institute of Rheumatology, Institute of Rheumatology, affiliation not provided to SSRN, University of Aberdeen, Helsinki University Hospital, affiliation not provided to SSRN, University of Ljubljana - University Medical Centre Ljubljana, University of Göttingen - University Medical Centre, affiliation not provided to SSRN, Landspitali University Hospital, Diakonhjemmet Hospital, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, UOD Reumatologia- Grande Ospedale Metropolitano, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, University of Medicine and Pharmacy Carol Davila Bucharest, affiliation not provided to SSRN, affiliation not provided to SSRN, University of Copenhagen - Department of Clinical Medicine, University of Copenhagen and University of Copenhagen - Department of Clinical Medicine