双J管预扩张输尿管软镜治疗肾下盏结石115例疗效分析
쌍J관예확장수뇨관연경치료신하잔결석115례료효분석
Analysis of clinical effect of double J-tubes pre-expansion of ureter under flexible ureteroscope on 115 patients with lower caliceal renal calculi
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