1. Department of Epidemiology, Johns Hopkins University, Baltimore, Maryland
2. Department of Medicine, Johns Hopkins University, Baltimore, Maryland
3. Department of Medicine, Yale University, West Haven, Connecticut
4. Centers for Disease Control and Prevention, Atlanta, Georgia
5. Vanderbilt University School of Medicine, Nashville, Tennessee
6. Department of Epidemiology, University of California, San Francisco
7. Mid-Atlantic Permanente Research Institute, Kaiser Permanente Mid-Atlantic States, Rockville, Maryland
8. University of Washington, Seattle
9. University of Calgary, Alberta, Canada
10. Kaiser Permanente Division of Research, Kaiser Permanente Northern California, Oakland
11. Northwestern University, Chicago, Illinois
12. BC Centre for Disease Control and Simon Fraser University, Vancouver, British Columbia, Canada
13. National Cancer Institute, Rockville, Maryland
14. Universidad Central del Caribe, Bayamon, Puerto Rico