Department of Epidemiology, School of Public Health, University of Michigan, Ann Arbor, MI, USA. Survey Research Center, Institute for Social Research, University of Michigan, Ann Arbor, MI, USA. Department of Cardiology, Medical Center Groningen, University of Groningen, Groningen, Netherlands. Department of Biostatistics, School of Public Health, University of Michigan, Ann Arbor, MI, USA. Department of Medicine, School of Medicine, University of Maryland Baltimore, Baltimore, MD, USA. Department of Nephrology, Medical Center Groningen, University of Groningen, Groningen, Netherlands. Department of Epidemiology, School of Public Health, University of Alabama at Birmingham, Birmingham, AL, USA. Department of Food and Nutrition, Seoul National University, Seoul, Republic of Korea. Division of Nephrology and Hypertension, Mayo Clinic, Rochester, MN, USA. Department of Epidemiology, School of Public Health, Seoul National University, Seoul, Republic of Korea. Institute of Environment and Health, Seoul National University, Seoul, Republic of Korea. College of Public Health, University of Kentucky, Lexington, KY, USA. Department of Nutritional Sciences, School of Public Health, University of Michigan, Ann Arbor, MI, USA. Department of Environmental Health Sciences, School of Public Health, University of Michigan, Ann Arbor, MI, USA. Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN, USA.