1. Department of Respiratory and Critical Care Medicine, The Third Affiliated Hospital of Soochow University, Changzhou, Jiangsu 213003, P.R. China
2. Department of Respiratory and Critical Care Medicine, Wuxi Fifth People's Hospital, Wuxi, Jiangsu 214000, P.R. China
3. Department of Tuberculosis, Huaian No. 4 People's Hospital, Huaian, Jiangsu 223000, P.R. China