Karolinska Institutet, University of Helsinki - Helsinki University Hospital, University of Amsterdam - Department of Rheumatology and Clinical Immunology, University of Copenhagen - Department of Clinical Medicine, Diakonhjemmet Hospital, University of Copenhagen, University of Gothenburg - Department of Rheumatology and Inflammation Research, Diakonhjemmet Hospital, University of Amsterdam - Amsterdam Rheumatology and Immunology Centre, Landspitali University Hospital, Karolinska Institutet, University of Southern Denmark, University of Eastern Finland, University of Iceland, University of Copenhagen, Karolinska University Hospital, Sahlgrenska University Hospital, University of Eastern Finland, Lund University, Karolinska Institutet, Diakonhjemmet Hospital, Helsinki University Hospital, Silkeborg Regional Hospital - Diagnostic Centre, Lund University, Uppsala University - Uppsala University Hospital, University of Southern Denmark, University of Amsterdam - Amsterdam Rheumatology and Immunology Centre, Falun Hospital, Ålesund Hospital, University of Bergen - Haukeland University Hospital, Odense University Hospital, Örebro University Hospital, Västmanland´s Hospital, Linkoping University, Karolinska Institutet, Aalborg University, Odense University Hospital, Trondheim University Hospital, Aarhus University, University Hospital of North Norway - Department of Rheumatology, University of Oslo - Department of Research Support for Clinical Trials, Diakonhjemmet Hospital and Diakonhjemmet Hospital