1. State Key Laboratory of Respiratory Diseases, Guangdong Key Laboratory of Vascular Diseases, National Clinical Research Center for Respiratory Diseases, Guangzhou Institute of Respiratory Health, The First Affiliated Hospital of Guangzhou Medical University, Guangzhou, Guangdong, China
2. Key Laboratory of National Health Commission for the Diagnosis and Treatment of COPD, Departments of Respiratory and Critical Diseases, Inner Mongolia Autonomous Region People's Hospital, Hohhot, China