1. Department of Respiratory Medicine, The Fourth Affiliated Hospital of Kunming Medical University, Kunming 650021, Yunnan, China
2. Department of Respiratory Medicine, The Affiliated Hospital of Yunnan University, The Second People’s Hospital of Yunnan Province, Kunming 650021, Yunnan, China
3. First Department of Respiratory Medicine, The First Affiliated Hospital of Kunming Medical University, Kunming 650032, Yunnan, China