已开展了几项比较不同防腐剂有效性的研究，但数据均存在局限性，并不具有结论性。
A few studies have been done to compare the effectiveness of the different preservatives but the data is limited and inconclusive.
尽管研究者争论饮食也牵涉其中，但过去的研究没有得到结论性的结果。
While researchers have argued that diet is also involved, past studies have produced inconclusive results.
最后一部分则是结论性综述，以本研究的主要认知和观点作以总结。
The last part is a conclusion survey, with the doing with the view in order to summarize mainly and cognitively of this research.
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