1. First Department of Pathology, Kansai Medical University, Moriguchi City, Osaka, Japan.
2. Department of Hematology and Oncology, Hokkaido University Graduate School of Medicine, Sapporo City, Japan.
3. Department of Stem Cell Disorders, Kansai Medical University, Moriguchi City, Osaka, Japan.
4. Department of Cardiovascular Medicine, Kyoto Prefectural University School of Medicine, Kyoto, Japan.