[4] Davis GL，Alter MJ，El-Serag H，et al. Aging of hepatitis C virus(HCV)-infected persons in the United States：a multiple cohort model of HCV prevalence and disease progression[J]. Gastroenterology，2010，138(2)：513-521.

    [5] Calle EE，Rodriguez C，Walker-Thurmond K，et al. Overweight， obesity，and mortality from cancer in a prospectively studied cohort of U.S. adults[J]. N Engl J Med ......