" Where a woman is in her menstrual cycle also influences how her body metabolizes, well, anything. Researchers know this: that's why, when they do include women in trials, they design the research so that women will be participating early in their cycles, when their hormones are most similar to a man's. Periods, then, have become something of an exclusionary pathology. "

― , Ask Me About My Uterus: A Quest to Make Doctors Believe in Women's Pain