由于新药上市前临床试验存在许多局限性，故上市后药品再评价非常重要。
The re-evaluation of the effectiveness of new drugs is of great importance when they are in post-market for there exist some limitations in clinical trials before these drugs are put on the market.
大样本多中心随机对照临床试验是药品上市后疗效再评价的最佳方法。
The large sample multi-centre randomized controlled trial is the best method of re-evaluation of the effectiveness of new drugs.
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