1. Center for treatment of Rheumatic and Musculoskeletal Diseases (REMEDY), Diakonhjemmet Hospital, Oslo, Norway
2. Faculty of Medicine, University of Oslo, Oslo, Norway
3. Department of Medicine, University of Otago, Wellington, New Zealand
4. Rheumatology Department, Hutt Hospital and Gisborne Hospital, Te Whatu Ora (Health New Zealand), Gisborne, New Zealand