单双荷包缝合在PPH治疗混合痔合并直肠内脱垂的手术效果对比研究
단쌍하포봉합재PPH치료혼합치합병직장내탈수적수술효과대비연구
Clinical study of PPH performing single or double purse-string in treatment of mixed hemorrhoid complicated with internal prolapse of rectum
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