1. Departments of Clinical Biochemistry and Molecular Biology, and
2. Department of Autoimmunology, Statens Serum Institut, Copenhagen S, Denmark
3. Rheumatology, University Hospital of Copenhagen, Hvidovre, Denmark
4. Department of Rheumatology, Glostrup Hospital, Glostrup, Denmark
5. The Parker Institute, Frederiksberg Hospital, Frederiksberg, Denmark
6. Department of Rheumatology, Rigshospitalet, Copenhagen, Denmark