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List of Abbreviations Author Contributions Conceptualization, J.M.C.-L., C.J.C.R., G.G.-L

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Two-tailed Students t-tests (for age of the study participants, age at menarche, years since menarche, and duration of menstrual bleeding), Fishers exact tests (for smoking status), and Chi square (for ethnicity, occupational status, and menstrual cycle stage) were used to compare Cases and Controls