1. Department of Pulmonary and Critical Care Medicine, General Hospital of Ningxia Medical University, Yinchuan, Ningxia 750004, China
2. The State Key Laboratory of Respiratory Disease, National Clinical Research Center for Respiratory Diseases, Guangzhou Institute of Respiratory Disease, The First Affiliated Hospital, Guangzhou Medical University, Guangzhou, Guangdong 510120, China
3. Department of Pulmonary and Critical Care Medicine, Shanxi Bethune Hospital, Shanxi Academy of Medical Sciences, Taiyuan, Shanxi 030002, China
4. GMU-GIBH Joint School of Life Sciences, Guangzhou Medical University, Guangzhou, Guangdong 510120, China
5. Department of Thoracic Surgery, General Hospital of Ningxia Medical University, Yinchuan, Ningxia 750004, China
6. Department of Anatomy and Cell Biology, Carver College of Medicine, University of Iowa, Iowa City Iowa 52242, USA