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Sensitivity and specificity forest plots for ultrasonographic ovarian markers in the diagnosis of polycystic ovary syndrome (PCOS). (A) Follicle number per ovary (FNPO), (B) ovarian volume (OV), (C) follicle number per cross-section (FNPS), and (D) OV (adolescents). TP: true positives; FP: false positives; FN: false negatives; TN: true negatives; CI: confidence interval.
