元宫药铜220和活性γ型宫内节育器临床效果对比

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李卫红于峰王丁博

Clinical effect compared between Yuangong medicine copper 220 IUD and activeγtype IUD

LI Weihong, YU Feng, WANG Dingbo

中国计划生育学杂志 . 2019, (12): 1664 .