Case–control studies on risk factors for chronic obstructive pulmonary disease: how does the sampling of the cases and controls affect the results? 期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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Case–control studies on risk factors for chronic obstructive pulmonary disease: how does the sampling of the cases and controls affect the results?

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