1. Department of Respiratory and Critical Care Medicine, Beijing Chao-Yang Hospital, Capital Medical University, Beijing 100020; Beijing Institute of Respiratory Medicine, Beijing 100020; Beijing Key Laboratory of Respiratory and Pulmonary Circulation, Beijing 100020; Beijing Engineering Research Center for Diagnosis and Treatment of Respiratory and Critical Care Medicine (Beijing Chao-Yang Hospital), Beijing 100020, China.
2. Department of Respiratory and Critical Care Medicine, Beijing Chao-Yang Hospital, Capital Medical University, Beijing 100020