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Two-tailed Student’s t-tests (for age of the study participants, age at menarche, years since menarche, and duration of menstrual bleeding), Fisher’s exact tests (for smoking status), and Chi square (for ethnicity, occupational status, and menstrual cycle stage) were used to compare Cases and Controls

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DHC Collagen Gummy:Collagen Gummies - Kyoho

Batches were tested to ensure low levels of endotoxin before use