Affiliation: | 1.Division of Infectious Diseases, University of Utah School of Medicine, Salt Lake City, Utah;2.Division of Epidemiology, Department of Internal Medicine, University of Utah School of Medicine, Salt Lake City, Utah;3.Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland;4.Division of Microbiology and Immunology, University of Utah School of Medicine, Salt Lake City, Utah |