1. Department of Respiratory Disease, Hiroshima Red Cross Hospital & Atomic-bomb Survivors Hospital, Naka-ku, Hiroshima, Japan
2. Department of Hematology, Hiroshima Red Cross Hospital & Atomic-bomb Survivors Hospital, Naka-ku, Hiroshima, Japan
3. Department of Molecular and Internal Medicine, Institute of Biomedical and Health Sciences, Hiroshima University, Minami-ku, Hiroshima, Japan