1. University Hospital; Zurich Switzerland
2. Swiss Clinical Quality Management Foundation; Zurich Switzerland
3. Praxis Rheuma-Basel; Basel Switzerland
4. Buergerspital; Solothurn Switzerland
5. Cantonal Hospital; Fribourg Switzerland
6. Balgrist University Hospital; Zurich Switzerland
7. rePROstat Biostatistical Consulting and Training; Bern
8. Hoffman- La Roche; Basel Switzerland
9. Bethesda Hospital; Basel Switzerland
10. Cantonal Hospital; St. Gallen Switzerland
11. University Hospital; Geneva Switzerland
12. Leiden University Medical Center; Leiden The Netherlands
13. Cochin Hospital; Paris France
14. Maastricht University Medical Center; Maastricht The Netherlands