1. Division of Rheumatology, Allergy, & Immunology, Tufts Medical Center, Boston, MA
2. Department of Epidemiology, University of Pittsburgh, Pittsburgh, PA
3. Department of Kinesiology, Michigan State University, East Lansing, MI
4. Department of Medicine and Epidemiology and Public Health, University of Maryland School of Medicine, Baltimore, MD
5. University of Arizona Arthritis Center, University of Arizona College of Medicine, Tucson, AZ
6. Department of Epidemiology and Biostatistics, University of California San Francisco, San Francisco, CA
7. Department of Medicine, Baylor College of Medicine, Houston, TX
8. Department of Population and Quantitative Health Sciences, University of Massachusetts Chan Medical School, Worcester, MA