1. Amsterdam Rheumatology and Immunology Center; Department of Rheumatology; VU University Medical Center; Amsterdam The Netherlands
2. Spaarne Gasthuis Haarlem; Haarlem The Netherlands
3. Regional Laboratory of Public Health; Kennemerland Haarlem; Haarlem The Netherlands
4. Spaarne Gasthuis Academie; Haarlem The Netherlands
5. Spaarne Medical Centre Alkmaar; Haarlem The Netherlands
6. Slotervaart Hospital; Amsterdam The Netherlands