1. Department of Respiratory and Critical Care Medicine, Shanxi Bethune Hospital, Shanxi Academy of Medical Sciences, Tongji Shanxi Hospital, Third Hospital of Shanxi Medical University , Taiyuan , Shanxi, 030032 , China
2. Department of Respiratory, Shanxi Provincial Hospital of Traditional Chinese Medicine , Taiyuan , 030012 , China
3. Department of Respiratory and Critical Care Medicine, Shanxi Bethune Hospital, Shanxi Academy of Medical Sciences, Tongji Shanxi Hospital, Third Hospital of Shanxi Medical University , No.99 of Longcheng Street, Xiaodian District, , Taiyuan , Shanxi, 030032 , China