1. Department of Clinical Sciences Lund, Section of Rheumatology, Lund University , Lund, Sweden
2. Department of Rheumatology, Skåne University Hospital , Lund and Malmö, Sweden
3. Department of Infectious Diseases, Institute of Biomedicine, University of Gothenburg , Gothenburg, Sweden
4. Department of Clinical Microbiology, Sahlgrenska University Hospital, Gothenburg, Sweden