Frequency and severity of Cervical spine injuries in motorcycle riders with and without helmet use. Journal of Pakistan Orthopaedic Association, [S. l.], v. 32, n. 01, p. 13–17, 2020. Disponível em: http://www.jpoa.org.pk/index.php/upload/article/view/391. Acesso em: 1 may. 2026.