2Cox D R. Regression model and life - tables ( with discussion ) [ J ].Journal of the Royal Statistical Society, Series B, 1972, 34:187.
3Van Hou welingen J C, tent Bokkel Huinink WW, van der Burg ME,et al. Predictability of the survival of patients with advanced ovarian cancer[J] .Journal of clinical oncology, 1989, 7:769.
