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Comparison of survival in patients with low- and high-risk stage I epithelial ovarian cancer. Kaplan-Meier survival curves showing the effects of FSS or RS on disease-free survival (a) (p = 0.580) and tumor-specific survival (b) (p = 0.883) among low-risk patients; the effect of FSS or RS on disease-free survival (c) (p = 0.776) and tumor-specific survival (d) (p = 0.111) among high-risk patients
