Division of Epidemiology, Mayo Clinic, Rochester, MN. Electronic address: cerhan.james@mayo.edu. Division of Cancer Epidemiology and Genetics, National Cancer Institute, Bethesda, MD. Epidemiology Research Program, American Cancer Society, Atlanta, GA. Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden; Department of Epidemiology, Harvard School of Public Health, Boston, MA. Division of Primary Care Internal Medicine, Mayo Clinic, Rochester, MN. Centre for MEGA Epidemiology, The University of Melbourne, Melbourne, Australia. Cancer Epidemiology Centre, Cancer Council Victoria, Melbourne, Australia. Cancer Prevention Institute of California, Fremont, CA. University of Minnesota School of Public Health, Minneapolis, MN. Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden; Department of Community Medicine, Faculty of Health Sciences, University of Tromsø, Tromsø, Norway; Cancer Register of Norway, Oslo, Norway; Samfundet Folkhälsan, Helsinki, Finland. Department of Nutrition, Harvard School of Public Health, Boston, MA. Division of Nutritional Epidemiology, The National Institute of Environmental Medicine, Karolinska Institutet, Stockholm, Sweden. Department of Population Health, New York University School of Medicine, New York, NY. City of Hope, Duarte, CA.