本文的研究方法以定性分析为主，结合定量分析，并辅以一定的实证分析。
This research method combined with qualitative analysis and quantitative analysis, and with some empirical analysis.
方法根据数据类型和分布特征采用相应的统计描述与推断方法，运用差距分析法进行安全性评价，并结合定性访谈结果进一步分析产生差距的原因。
Methods a descriptive statistical methods was employed. A qualitative method, such as key informant interview was also used to evaluate the causes of the disparities.
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