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Decision curve analysis for the risk nomogram for worsening of GERD symptoms after LSG. The y-axis measured the net benefit. The thick solid line represented the assumption that all patients had no worsening of GERD symptoms after LSG. The thin solid line represented the assumption that all patients had worsening of GERD symptoms after LSG. The red line represents the risk nomogram. (Fig. 6A) From the training set and (Fig. 6B) from the validation set.
