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Warm ischemic time (black line) and cumulative sum (CUSUM)OT (blue line) plotted against case number. The red line represents the best fit for the plot using a second-order polynomial with equation CUSUMWIT = –0.1544 × case number2 + 7.8687 × case number – 21.939 (R2 = 0.6637), corresponding to 3 distinct phases of the warm ischemic time.
