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. Author manuscript; available in PMC: 2016 Dec 8.
Published in final edited form as: Gynecol Oncol. 2015 Sep 24;139(3):495–499. doi: 10.1016/j.ygyno.2015.09.015

Fig. 1.

Fig. 1

Survival graph by O/E* category. Improved survival probability is noted when a minimum hospital case volume of 5 is combined with middle to high O/E. * O/E: observed-to-expected ratio.