Tangpaisarn, T., Pungroong, D., Pholkerd, P., Klinpoon, K., Aksornmee, C., Phothisuwan, T., Sinsang, P., Kuhirunyaratn, P. and Pinitsoontorn, S. 2014. Proportions of Helmet Wearing in Medical Students KhonKaen University. Srinagarind Medical Journal. 29, 4 (Nov. 2014), 87.