Tangpaisarn, T.; Pungroong, D.; Pholkerd, P.; Klinpoon, K.; Aksornmee, C.; Phothisuwan, T.; Sinsang, P.; Kuhirunyaratn, P.; Pinitsoontorn, S. Proportions of Helmet Wearing in Medical Students KhonKaen University. SRIMEDJ 2014, 29, 87.