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Copper ion releasing IUDs are more effic...

Copper ion releasing IUDs are more efficient than non-medicated methods. Why ?

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Copper-ions releasing IUDs like Cu-T, Cu-7 and multiload-375 are more efficient than non-medicated IUDs (e.g. Lippe.s loop) as Cu-ions released by them inhibit the motility of the sperms.
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