1. State Key Laboratory of Respiratory Disease, The First Affiliated Hospital of Guangzhou Medical University, Guangzhou Institute of Respiratory Disease, National Clinical Research Center for Respiratory Disease, Guangzhou, China
2. The Second Affiliated Hospital of Guangdong Medical University, Zhanjiang, China
3. The Fifth People's Hospital of Dongguan, Dongguan, China
4. Guangzhou Medical University, Guangzhou, China