1. Data (Report No. DOT HS 812 492);National Center for Statistics and Analysis,2016
2. Traffic accident statistics. 2016 statistics. The Korea ROAD traffic authority. Wonju-Si;Traffic Accident Analysis System,2017
3. Federally mandating motorcycle helmets in the United States;Eltorai;BMC Public Health,2016
4. The economic impact of helmet use on motorcycle accidents: a systematic review and meta-analysis of the literature from the past 20 years;Kim;Traffic Inj Prev,2015
5. Countermeasures that work: a highway safety countermeasure guide for state highway safety offices;Goodwin,2015