1. Key Laboratory of National Health Commission for the Diagnosis & Treatment of COPD Inner Mongolia People's Hospital Hohhot Inner Mongolia China
2. Graduate School Baotou Medical College Baotou Inner Mongolia China
3. 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