This study takes the combination of questionnaire and interview methods of investigation.
本研究采用问卷和访谈相结合的调查方法。
Online questionnaires and interview are the major methods used in this research.
研究采用在线问卷调查和个别访谈研究相结合的方式进行。
Methods of deep interview and comparative study were employed.
研究方法：深度访谈法和比较分析法。
Methods By descriptive study and telephone interview.
方法描述性研究、电话随访。
Methods By descriptive study and telephone interview.
方法描述性研究、电话随访。
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