The purpose of this study is to determine whether the susceptibility of women to environment exposures, and their urinary elimination differ between follicular and luteal phases of menstrual cycle.
Women aged 19-35 years who have menstruated in the last three months and have not taken exogenous hormones (CHC, levonorgestrel-releasing IUD, estrogen or progestin or progesterone) within the last three months may participate.
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