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Computer illustration showing the female reproductive system, including the bladder, uterus and ovaries. The endometrium (lining of the uterus) is extending outside the uterus, into the fallopian tube, ovary and abdominal cavity, in a disease called endometriosis. It causes intense pain in the pelvic region. (KEYSTONE/SCIENCE PHOTO LIBRARY/TUMEGGY/SCIENCE PHOTO LIBRARY)