1. Department of Respiratory Medicine, The First Affiliated Hospital, Nanjing Medical University, 300 Guangzhou Road, Nanjing 210029, China
2. Department of Respiratory Medicine, The Second Affiliated Hospital, Nanjing Medical University, 121 Jiangjiayuan Road, Nanjing 210011, China
3. Department of Pathology, The First Affiliated Hospital, Nanjing Medical University, 300 Guangzhou Road, Nanjing 210029, China