设计：分层抽样，随机分组对照，量效分析。
DESIGN: Grade sampling, randomized controlled quantitative analysis.
说明了本调查研究的抽样方案以及资料收集和分析方法。
Illustrates the sampling of this research program, as well as data collection and analysis methods.
医生要我小便以作化验分析的抽样。
The doctor asked me to make water to provide a specimen for analysis.
医生要我小便以作化验分析的抽样。
The doctor asked me to make water to provide a specimen for analysis.
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