1. Department of Internal Medicine, Tsuyama Chuo Hospital, Okayama, Japan,
2. Department of Hematology, Oncology and Respiratory Medicine, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, Japan,
3. Department of Internal Medicine, Okayama Rosai Hospital, Okayama, Japan,
4. Department of Pathology, Faculty of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, Okayama, Japan,
5. Department of Hematology, Oncology, and Respiratory Medicine, Faculty of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, Okayama, Japan