1. Department of Hematology, Rheumatology, and Infectious Diseases, Graduate School of Medical Sciences, Faculty of Life Sciences, Kumamoto University, Kumamoto 860-8556, Japan
2. Department of Laboratory Medicine, Kumamoto University Hospital, Kumamoto 860-8556, Japan
3. Department of Blood Transfusion and Cell Therapy, Kumamoto University Hospital, Kumamoto 860-8556, Japan
4. Department of Hematology, Rheumatology, and Infectious Diseases, Kumamoto University Hospital, Kumamoto 860-8556, Japan
5. Department of Surgery, National Hospital Organization Kumamoto Medical Center, Kumamoto 860-0008, Japan
6. Department of Surgery, Yamaga City Medical Center, Kumamoto 861-0501, Japan
7. Collaborative Research Program for Anti-Viral Agents and Hematological Diseases, Division of Clinical Retrovirology, Joint Research Center for Human Retrovirus Infection, Kumamoto University, Kumamoto 862-0973, Japan