affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, University of Copenhagen - Department of Clinical Medicine, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, Karolinska Institutet - Clinical Epidemiology Division, affiliation not provided to SSRN, Institute of Rheumatology, Institute of Rheumatology, University of Medicine and Pharmacy Carol Davila Bucharest, University of Copenhagen - Department of Clinical Medicine, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, Diakonhjemmet Hospital, District General Hospital of Førde - Section for Rheumatology, affiliation not provided to SSRN, University of Göttingen - University Medical Centre, Landspitali University Hospital, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, - Hospital General Universitario Gregorio Marañón, University of Aberdeen - Aberdeen Centre for Arthritis and Musculoskeletal Health (Epidemiology Group), affiliation not provided to SSRN and University of Copenhagen