Comparison of the lower limit of normal to the fixed ratio method for the diagnosis of airflow obstruction at high altitudes: a large cross-sectional survey of subjects living betw... by Yilin Huang, Zhenzhen Xing, Jean-Paul Janssens, Di Chai, Weiming Liu, Yuxia Wang, Yali Ma, Yaqi Tong, Yanfei Guo

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