HEYDARI, Seyed Taghi et al. The prevalence and effective factors of crash helmet usage among motorcyclists in Iran. Journal of Injury and Violence Research, [S.l.], v. 8, n. 1, p. 1-5, sep. 2015. ISSN 2008-4072. Available at: <http://jivresearch.org/jivr/index.php/jivr/article/view/667>. Date accessed: 13 dec. 2017.