Methods: The 46 cases of HCPH were divided into two groups randomly.

方法：46例门静脉高压征患者随机分成两组。

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Methods 297 canals of 147 patients with 163 teeth were divided into two groups randomly.

方法选择需进行根管治疗者147人163颗牙297个根管，随机分为两组。

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Method:40 curved mesial-buccal canals in mandibular molars were selected and divided into two groups randomly. Each group had 20 canals.

方法：选取40个下颌磨牙近中颊侧弯曲根管，随机分为两组，每组2 0个根管。

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This study randomly divided patients into two groups - one received the antibiotic and the other was given a placebo, an inert treatment in the form of a sugar pill, three times a day for seven days.

BBC: Antibiotics 'ineffective for coughs'