1. Division of Rheumatology, Department of Medicine, George Washington University School of Medicine and Health Sciences, Washington, DC, USA
2. Environmental Autoimmunity Group, Clinical Research Branch, National Institute of Environmental Health Sciences, National Institutes of Health, Bethesda, MD, USA
3. Biostatistics & Computational Biology Branch, National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, NC, USA
4. Veteran’s Affairs Medical Center, University of Oklahoma Health Sciences Center, Oklahoma Medical Research Foundation, Oklahoma City, OK, USA
5. IWK Health Centre and Dalhousie University, Halifax, NS, Canada