1. King Christian 10th Hospital for Rheumatic Diseases, Gråsten, Denmark; and University of Southern Denmark; Odense Denmark
2. Aarhus University; Aarhus Denmark
3. North Denmark Regional Hospital; Hjørring Denmark
4. Rufibach rePROstat, Bern, Switzerland; and F. Hoffmann-La Roche; Basel Switzerland
5. Clinic Benefit; Frederikshavn Denmark