All the subjects who had acute upper and lower respiratory tract infection, acute bronchitis or other lung infections were excluded from this study.

所有研究对象均除外急性上呼吸道感染、急性支气管炎及其他肺部感染等呼吸系统疾病。

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All the subjects who had acute upper and lower respiratory tract infection, acute bronchitis or other lung infections were excluded from the study.

所有研究对象均除外急性上呼吸道感染、急性支气管炎及其他肺部感染等呼吸系统疾病。

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