control-observation of case
control-observation of case
病例对照观察
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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Methods 76 patients with spontaneous pneumothorax were randomly divided into observation group and control group, 38 case of each.
方法自发性气胸患者76例随机分为观察组和对照组各38例。
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