1. Aalborg University, Aalborg, Denmark, and North Denmark Regional Hospital Hjoerring Denmark
2. Danish Hospital for Rheumatic Diseases Sønderborg Denmark
3. Skane University Hospital Malmö Sweden
4. Hospital Lillebaelt, Kolding, Denmark, and University of Southern Denmark Odense Denmark
5. Danish Hospital for Rheumatic Diseases, Sønderborg, Denmark, and University of Southern Denmark, Odense, Denmark, and Lund University Lund Sweden