The association of age, sex and helmet use with the risk of death for occupants of two-wheeled motor vehicles involved in traffic crashes in Spain

1. Donate-López, C.
2. Espigares-Rodríguez, E.
3. Jiménez-Moleón, J.J.
4. Luna-del-Castillo, J.d.D.
5. Bueno-Cavanillas, A.
6. Lardelli-Claret, P.