1. Division of Rheumatology, Department of Medicine, Northwestern University Feinberg School of Medicine, Chicago, Illinois, USA
2. Division of Clinical Immunology and Rheumatology, Department of Medicine, School of Medicine, the University of Alabama at Birmingham, Birmingham, Alabama, USA; The Department of Epidemiology, School of Public Health, the University of Alabama at Birmingham, Birmingham, Alabama, USA
3. The Department of Epidemiology, School of Public Health, the University of Alabama at Birmingham, Birmingham, Alabama, USA
4. Division of Rheumatology, Department of Medicine, Johns Hopkins University, School of Medicine, Baltimore, Maryland, USA
5. Division of Rheumatology, Department of Medicine, the University of Puerto Rico Medical Science Campus, San Juan, Puerto Rico, USA
6. Division of Clinical Immunology and Rheumatology, Department of Medicine, School of Medicine, the University of Alabama at Birmingham, Birmingham, Alabama, USA
7. Division of Rheumatology, Department of Medicine, School of Medicine, the University of Texas Health Science Center at Houston, Houston, Texas, USA