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Marginal Changes in Motor Vehicle Crash–Related Emergency Department Visits: 4 US States, 2007–2014
Note. We used Arizona as the control state as it never passed a ban. These marginal changes also account for all control variables listed in our analyses. California passed a primary ban on all drivers on July 1, 2009; Kentucky on July 15, 2010; Rhode Island on November 9, 2009; and Utah on May 12, 2009.
