1. Department of Respiratory and Critical Care Medicine, Tianjin First Central Hospital , Tianjin , 300192 , China
2. Department of Clinical Laboratory, Tianjin First Central Hospital , Tianjin , 300192 , China
3. Department of Respiratory and Critical Care Medicine, Tianjin First Central Hospital , 24 Fukang Road, Nankai District , Tianjin , 300192 , China