1 Department of Respiratory Medicine, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan. Electronic address: kazukomd@nagasaki-u.ac.jp.
2 Department of Hematology, Atomic Bomb Disease and Hibakusha Medicine Unit, Atomic Bomb Disease Institute, Nagasaki University, Nagasaki, Japan.
3 Department of Respiratory Medicine, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan.
4 Department of Pathology, Nagasaki University Hospital, Nagasaki, Japan.
5 Department of Clinical Oncology, Nagasaki University Hospital, Nagasaki, Japan.