1. Department of Hematology National Hospital Organization Iwakuni Clinical Center Iwakuni Japan
2. Department of Hematology, Oncology and Respiratory Medicine Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences Kita‐ku Japan
3. Department of Pathology National Hospital Organization Iwakuni Clinical Center Iwakuni Japan
4. Department of Respiratory Medicine National Hospital Organization Iwakuni Clinical Center Iwakuni Japan