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The rate of premenopausal breast cancer is about 30 out of 100,000 women per year in those who have never used oral contraceptives. One study

The rate of premenopausal breast cancer is about 30 out of 100,000 women per year in those who have never used oral contraceptives. One study estimated that the relative risk of breast cancer for oral contraceptive users versus non-users is 1.19. What is the corresponding number needed to harm?

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