1. Department of Pathology, Yonsei University College of Medicine, Seoul 03722, Republic of Korea
2. Division of Pulmonology, Department of Internal Medicine, Institute of Chest Diseases, Severance Hospital, Yonsei University College of Medicine, Seoul 03722, Republic of Korea
3. Division of Hematology, Department of Internal Medicine, Severance Hospital, Yonsei University College of Medicine, Seoul 03722, Republic of Korea