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. 2016 Jun 9;6:27645. doi: 10.1038/srep27645

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Kaplan-Meier survival curves shows 30-day mortality in surgical patients with preoperative IABP (red line) and without preoperative IABP (control, blue line) before (A) and after (B) propensity-score matching. IABP denotes intra-aortic balloon pump.