1 Division of Epidemiology and Biostatistics, School of Public Health, University of Illinois at Chicago, Chicago, IL School of Nursing, University of Michigan, Ann Arbor, MI Department of Epidemiology, Geisel School of Medicine at Dartmouth, Hanover, NH Department of Public Health Sciences, The University of Chicago, Chicago, IL Division of Epidemiology and Biostatistics, School of Public Health, University of Illinois at Chicago, Chicago, IL, argos@uic.edu.