1. Clinical Epidemiology Division, Department of Medicine Solna Karolinska Institutet Stockholm Sweden
2. Rheumatology, Theme Inflammation and Ageing Karolinska University Hospital Stockholm Sweden
3. Faculty of Medicine, School of Health Sciences University of Iceland Reykjavík Iceland
4. Division of Pharmacoepidemiology and Pharmacoeconomics Brigham and Women's Hospital/Harvard Medical School Boston Massachusetts USA
5. Division of Rheumatology, Inflammation, and Immunity Brigham and Women's Hospital/Harvard Medical School Boston Massachusetts USA