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. 2023 Apr 16;13:6190. doi: 10.1038/s41598-023-33269-x

Figure 2.

Figure 2

Cumulative sum analysis of the operative time. An uphill slope and down slope indicate an increasing trend and decreasing trend, respectively. The peak indicates the point of overcoming the learning curve. Overall, 13, 18, and 31 patients are required to be proficient in LPD, RPD, and MIPD, respectively.