输尿管镜与后腹腔镜手术治疗输尿管上段结石的疗效比较
수뇨관경여후복강경수술치료수뇨관상단결석적료효비교
The observation of the effect of ureteroscopic lithotripsy (URL)and retroperitoneal laparoscopic ureterolithotomy (RLU) on unilateral upper ureteral stones
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