Affiliation: | 1. Department of Respiratory Medicine, Ningxia Hui Autonomous Region People's Hospital, Yinchuan, Ningxia, China Department of Respiratory Medicine, The First Affiliated Hospital of Northwest University for Nationalities, Yinchuan, Ningxia, China;2. Second Department of Internal Medicine, Luohe Hospital of Traditional Chinese Medicine, Luohe, Henan, China;3. Department of Respiratory Medicine, Suzhou Science & Technology Town Hospital, Suzhou, Jiangsu, China |