Read MoreMillions of women use apps to track their menstrual cycle, but many say they do not work well enough.Millions of women use apps to track their menstrual cycle, but many say they do not work well enough.
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Read MoreMillions of women use apps to track their menstrual cycle, but many say they do not work well enough.Millions of women use apps to track their menstrual cycle, but many say they do not work well enough.