1. Leiden University Medical Center; Leiden The Netherlands
2. University of California San Francisco and San Francisco VA Medical Center; San Francisco California
3. Neil Betteridge Associates; London UK
4. Charité-University Medicine Berlin; Free University, and Humboldt University Berlin; Berlin Germany
5. University of Michigan; Ann Arbor
6. Mayo Clinic College of Medicine; Rochester Minnesota
7. Amsterdam Rheumatology and Immunology Center; Amsterdam The Netherlands
8. Rheumatology Associates and UT Southwestern Medical Center; Dallas Texas