以下为句子列表：
英文: Methods:Clini cal materials of 40 cases of patients underwent open operation for complicated nephrolithiasis were analyzed ret rospectively: 22 of them received both internal stent and external stent and the remaining 18 received either inter nal stent or
中文: 方法：回顾性分析比较复杂肾结石术后内外双引流22例(双引流组)和内或外单引流18例(单引流组)的疗效和并发症情况。
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