1. Department of Respirology, Peking Union Medical College Hospital, Beijing 100730, P.R. China
2. Department of Cardiology, Peking Union Medical College Hospital, Beijing 100730, P.R. China
3. Department of Pathology, Peking Union Medical College Hospital, Beijing 100730, P.R. China
4. Department of Radiology, Peking Union Medical College Hospital, Beijing 100730, P.R. China