1. Department of Respiratory and Critical Care Medicine, Zhongda Hospital, School of Medicine, Southeast University, Nanjing, Jiangsu 210009, P.R. China
2. Department of Nuclear Medicine, Zhongda Hospital, School of Medicine, Southeast University, Nanjing, Jiangsu 210009, P.R. China
3. Department of Pathology and Pathophysiology, School of Medicine, Southeast University, Nanjing, Jiangsu 210009, P.R. China