1. Department of Preventive Medicine, Northwestern University Feinberg School of Medicine, Chicago, IL 60611, USA
2. Division of Biostatistics, Washington University, St. Louis, MO 63110, USA
3. Division of Epidemiology and Community Health, School of Public Health, University of Minnesota, Minneapolis, MN 55455, USA
4. Department of Biostatistics, Boston University School of Public Health, Boston, MA 02118, USA
5. Department of Medicine, Division of Epidemiology, Vanderbilt Epidemiology Center, Vanderbilt University School of Medicine, Vanderbilt-Ingram Cancer Center, Vanderbilt University Medical Center, Nashville, TN 37232, USA
6. Department of Human Genetics, David Geffen School of Medicine, University of California, Los Angeles, CA 90095, USA
7. Department of Biostatistics, Fielding School of Public Health, University of California, Los Angeles, CA 90095, USA
8. University of California at San Francisco School of Medicine, San Francisco, CA 94143, USA
9. Department of Medicine, Northwestern University Feinberg School of Medicine, Chicago, IL 60611, USA