1 Department of Epidemiology and the Welch Center for Prevention, Epidemiology, and Clinical Research, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD.
2 Division of Endocrinology, Diabetes, and Metabolism, Department of Medicine, Johns Hopkins School of Medicine, Baltimore, MD.
3 Department of Epidemiology and the Welch Center for Prevention, Epidemiology, and Clinical Research, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD eselvin@jhu.edu.