Links
[1] http://aje.oxfordjournals.org/content/early/2014/01/27/aje.kwt327.full.pdf+html
[2] http://rethinkpot.org/tags/study
[3] http://rethinkpot.org/tags/car-accident%2A
[4] http://rethinkpot.org/tags/national
[5] http://rethinkpot.org/tags/epidemiology