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Scatterplot of maximum follicle diameter and serum hormones (FSH, LH, E2 and progesterone) on the scheduled day. In the natural cycle group, cases with a spontaneous LH surge are marked as blue spots, and cases with a GnRHa trigger are marked as green spots. Cases in the MPA group are marked as red spots. The vertical axis represents the hormone levels on the scheduled day (log scale). The horizontal axis represents the maximum diameter of the follicle
