3Moss R, Lucente FE. Results in resident cholasteatoma surgery: a review of 85 cases[J]. Laryngoscope,1987,97(2) :212 -214.
4Lage H, Helmbach H, Dietel M, et al. Modulation of DNA topoisomerase Ⅰ activity and expression in melanoma cell with acquired drug resistance[J]. Br J Cancer,2000,82(2) :488 -491.
