database comparison 数据库比较
database key comparison 数据库键比较
comparison database
比较数据库
以上为机器翻译结果，长、整句建议使用 人工翻译 。
In the paper on that study, published in the journal Pharmacoepidemiology and Drug Safety, the authors claim they didn't have enough patients on Actos in their database to make a comparison.
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