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Sequential first and second trimester screening tests: correlation of the markers' levels in normal versus Down syndrome affected pregnancies †
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The 'pill scare II' two years later.
- The European journal of contraception & reproductive health care : the official journal of the European Society of Contraception
Overall the differences in relative risk observed between users of OCs with a similar estrogen but different progestogen content appear to be associated with the life cycle of the different commercial formulations on the market and user characteristics. Expand