1. Department of Rheumatology; North Denmark Regional Hospital; Hjørring Denmark
2. Department of Health Science and Technology; Aalborg University; Aalborg Denmark
3. Department of Clinical Microbiology; Division of Clinical Immunology; Umeå University; Umeå Sweden
4. Centre of Clinical Science; North Denmark Regional Hospital; Hjørring Denmark
5. Department of Pharmaceutical Biosciences; Uppsala University; Uppsala Sweden
6. Department of Clinical Medicine; Aalborg University; Aalborg Denmark