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本研究采用随机分配原则,用湖南、山东、河北研制的三种银夹行腹部小切口绝育术,进行前瞻性调查,以正确评价其有效性及安全性,为该术的
In this study, the principle of random distribution, using three silver clip in Hunan, Shandong, Hebei developed small abdominal incision sterilization, prospective investigation to correctly assess the effectiveness and safety of the operation