1. Department of Radiology; Seoul St Mary's Hospital, College of Medicine, The Catholic University of Korea; Seoul Korea
2. Department of Pathology; Seoul St Mary's Hospital, College of Medicine, The Catholic University of Korea; Seoul Korea
3. Division of Respiratory and Critical Care; Department of Internal Medicine; Seoul St Mary's Hospital, College of Medicine, The Catholic University of Korea; Seoul Korea
4. Department of Radiology; St Vincent's Hospital; College of Medicine; The Catholic University of Korea; Suwon Gyeonggi-do Korea