Comparison of Multiple Chronic Obstructive Pulmonary Disease (COPD) Indices in Chinese COPD Patients by Jinsong Zhang, M.M.S., Anastasia Miller, Ph.D., Yongxia Li, Ph.D., Qinqin Lan, M.A., Ning Zhang, Ph.D., M.D., M.P.H., Yanling Chai, M.M.S., Bing Hai, M.M.S.

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