Department of Respiratory Medicine, Henan Provincial Peoples Hospital, Peoples Hospital of Zhengzhou University, Zhengzhou, Henan, China.|Department of Respiratory Medicine, Peoples Hospital of Zhengzhou University, Zhengzhou, Henan, China.|Department of Respiratory Medicine, Henan Provincial Peoples Hospital, Peoples Hospital of Zhengzhou University, Zhengzhou, Henan, China.|Department of Respiratory Medicine, Henan Provincial Peoples Hospital, Peoples Hospital of Zhengzhou University, Zhengzhou, Henan, China.|Department of Respiratory Medicine, Henan Provincial Peoples Hospital, Peoples Hospital of Zhengzhou University, Zhengzhou, Henan, China.|Department of Respiratory Medicine, Henan Provincial Peoples Hospital, Peoples Hospital of Zhengzhou University, Zhengzhou, Henan, China.|Department of Respiratory Medicine, Henan Provincial Peoples Hospital, Peoples Hospital of Zhengzhou University, Zhengzhou, Henan, China.|Department of Health Sciences Research, Mayo Clinic, Rochester, MN, USA.|Department of Respiratory Medicine, Henan Provincial Peoples Hospital, Peoples Hospital of Zhengzhou University, Zhengzhou, Henan, China.