1.Department of Internal Medicine, School of Clinical Medicine, Hubei University of Science and Technology, Xianning 437100, Hubei Province, China
2.National Experimental Teaching Demonstration Center for General Practice, Hubei University of Science and Technology, Xianning 437100, Hubei Province, China
3.Department of Respiratory and Critical Care Medicine, Xianning Central Hospital, the First Affiliated Hospital of Hubei University of Science and Technology, Xianning 437000, Hubei Province, China
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