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A. Kaplan–Meier curve for family history of male infertility versus time to pregnancy (TTP) in patients; B. Kaplan–Meier curve for family history of male infertility versus time to pregnancy (TTP) in controls; C. Kaplan–Meier curve for education versus time to pregnancy (TTP) in patients; D. Kaplan–Meier curve for education versus time to pregnancy (TTP) in controls
