1. Department of Rheumatology and Inflammation Research, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden;
2. Department of Immunology and Microbiology, University of Colorado School of Medicine, Aurora, CO, USA;
3. Department of Infectious Diseases, Skaraborg Hospital, Skövde, Sweden;
4. Department of Veterans Affairs Eastern Colorado Healthcare System, Denver, CO, USA;
5. Department of Rheumatology, Sahlgrenska University Hospital, Gothenburg, Sweden