Heydari, Seyed Taghi, Lankarani, Kamran, Vossoughi, Mehrdad, Javanmardi, Kazem, Sarikhani, Yaser, Mahjoor, Kourosh, Mahmoodi, Mojtaba, Khabaz Shirazi, Mohammad, AND Akbari, Maryam. " The prevalence and effective factors of crash helmet usage among motorcyclists in Iran" Journal of Injury and Violence Research [Online], Volume 8 Number 1 (10 September 2015)