1. Department of Rheumatology, Immunology and Allergology Inselspital Bern University Hospital BernSwitzerland
2. Department of Clinical Chemistry Inselspital Bern University Hospital Bern Switzerland
3. Swiss Clinical Management Foundation (SCQM) SCQM Office Zürich Zürich Switzerland
4. Rheumatologische Praxis Hofheim am Taunus Germany
5. Division of Rheumatology Department of Internal Medicine Geneva University Hospital GenevaSwitzerland
6. Department of Rheumatology Basel University Hospital Basel Switzerland