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History of ovarian stimulation. 1970ClomifenhMG1980GnRH-agonist / hMG1990recFSH / hMGGnRH-antagonist / hMG or recFSH. Aim of ovarian stimulation for ART. simple: soft stimulationsafe: less ovarian hyperstimulation syndromescomfortable: less multiplessuccessful: high pregnancy ratescheap: most difficult point.
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