方法问卷法、跨文化比较法及随机抽样调查，按各村18岁至45岁人口比例抽取样本。
Methods Applying answering questionnaires, contrasting cross culture and getting the sample at random. Then we chose each village came from 18 to 45 year-old sample.
方法问卷法、跨文化比较法及随机抽样调查，按各村18岁至45岁人口比例抽取样本。
Methods Applying answering questionnaires, contrasting cross culture and getting the sample at random. Then we chose each village came from 18 to 45 year-old sample.
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