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| | Infertility |
 | | The term secondary infertility describes couples who have previously been pregnant at least once, but have not been able to achieve another pregnancy. |
 | | Approximately 30% to 40% of all infertility is due to a "male" factor, such as retrograde ejaculation, impotence, hormone deficiency, environmental pollutants, scarring from sexually transmitted disease, or decreased sperm count. |
 | | A "female" factor -- scarring from sexually transmitted disease or endometriosis, ovulation dysfunction, poor nutrition, hormone imbalance, ovarian cysts, pelvic infection, tumor, or transport system abnormality from the cervix through the fallopian tubes -- is responsible for 40% to 50% of infertility in couples. |
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