1 Renal-Electrolyte and Hypertension Division, Philadelphia, Pennsylvania; Department of Biostatistics, Epidemiology, and Informatics, Philadelphia, Pennsylvania; Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania. Electronic address: jco@pennmedicine.upenn.edu.
2 Intermountain Healthcare Department of Population Health Sciences, Spencer Fox Eccles School of Medicine, University of Utah, Salt Lake City, Utah.