TY - JOUR AU - Ivers R. AU - Hung D. AU - Stevenson Mark BT - Accident Analysis and Prevention CN - Y LA - eng LB - injuryjournal M1 - 4 PY - 2008 SP - 1627 EP - 33. T2 - Accident Analysis and Prevention TI - Barriers to, and factors associated, with observed motorcycle helmet use in Vietnam VL - 40 ER -