1. Division of Rheumatology, Department of Medicine, Center for Clinical Epidemiology and Biostatistics, Center for Pharmacoepidemiology Research and Training, Perelman School of Medicine at the University of Pennsylvania, White Building, Room 5024, 3400 Spruce St, Philadelphia, PA, USA
2. Division of Rheumatology, Department of Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA, USA
3. Department of Dermatology, Perelman School of Medicine at the University of Pennsylvania, South Tower, 7th Floor, 3400 Civic Center Blvd, Philadelphia, PA, USA
4. Department of Dermatology, Center for Clinical Epidemiology and Biostatistics, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA, USA
5. Division of Rheumatology/Department of Medicine, Faculty of Medicine, University of Iceland, Reykjavik, Iceland
6. Department of Science, Landspitali University Hospital, Reykjavik, Iceland
7. Division of Rheumatology and Allergy/Immunology, Massachusetts General Hospital, 55 Fruit Street, Bulfinch 165, Boston, MA, USA
8. Section of Inflammation and Cardiometabolic Diseases, National Heart, Lung, and Blood Institute, 10 Center Drive, Bethesda, MD, USA
9. Department of Biostatistics and Epidemiology, Center for Clinical Epidemiology and Biostatistics, Center for Pharmacoepidemiology Research and Training, Perelman School of Medicine at the University of Pennsylvania, 8th Floor, Blockley Hall, 423 Guardian Drive, Philadelphia, PA, USA