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| Q. |
All of the following mechanisms might account for a reduced risk of upper genital tract infection in users of progestin releasing IUDs, except: |
| A. | Reduced retrograde menstruation |
| B. | Decreased ovulation |
| C. | Thickened cervical mucus |
| D. | Decidual changes in the endometrium |
| E. | All of the above |
| Answer» E. All of the above | |
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