Anna M Johnson,1 Christopher J Cunningham,2 Evan Arnold,3 Wayne D Rosamond,1 Jessica K Zègre-Hemsey4 1Department of Epidemiology, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA; 2Department of Emergency Medicine, Henry Ford Hospital, Detroit, MI, USA; 3Institute for Transportation Research and Education, North Carolina State University, Raleigh, NC, USA; 4School of Nursing, University of North Carolina at Chapel Hill, Chapel Hill, NC, USACorrespondence: Anna M JohnsonDepartment of Epidemiology, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, 123 W Franklin St, Suite 410, Chapel Hill, NC, 27516 USATel +704 929-0314Email anna.johnson@unc.eduAbstr...