

1Department of Pulmonary and Critical Care Medicine, Affiliated Fuzhou First Hospital of Fujian Medical University, Fuzhou, Fujian 350009, P. R. China
2Department of Pulmonary and Critical Care Medicine, 900 Hospital of the Joint Logistics Team, Fuzhou, Fujian 350001, P. R. China
3Department of Respiratory Medicine, Nanping First Hospital Affiliated to Fujian Medical University Nanping City, Fujian 353006, P. R. China
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