Objective: to study the effect and adverse reaction of active intrauterine device (IUD) and to provide evidences for the selection of IUD.
目的：进一步了解活性宫内节育器(IUD)使用效果和不良反应，为临床选择IUD提供有效依据。
Objective: to study the effect and adverse reaction of active intrauterine device (IUD) and to provide evidences for the selection of IUD.
目的：进一步了解活性宫内节育器(IUD)使用效果和不良反应，为临床选择IUD提供有效依据。
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