1. Epidemiology Branch, National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, NC 27709, USA
2. Center for Population Health, Duke University School of Medicine, Durham, NC 27710, USA
3. Departments of Clinical Cancer Prevention, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
4. Division of Rheumatology, University of Colorado School of Medicine, Aurora, CO 80045, USA