7Hu G, Baker S P. Trends in unintentional injury deaths, U. S. , 1999 2005: age, gender, and racial/ethnic diffe- rences[J]. Am J Prev Med,2009,37(3):188-194.
8Haddon Jr W. The changing approach to the epidemiolo- gy, prevention, and amelioration of trauma: the transition to approaches etiologically rather than descriptively based [J]. Inj Prev,1999,5(3) :231-235.
