1. Department of Internal Medicine and Clinical Immunology; Yokohama City University Graduate School of Medicine; Yokohama; Japan
2. Department of Medical Oncology; Kanagawa Cancer Centre; Yokohama; Japan
3. Department of Haematology/Immunology; Fujisawa City Hospital; Fujisawa; Japan
4. Department of Haematology; Yokohama City University Medical Centre; Yokohama; Japan
5. Department of Haematology; Shizuoka Red Cross Hospital; Shizuoka; Japan
6. Department of Haematology; Yamato City Hospital; Yamato; Japan
7. Department of Haematology; Yokosuka City Hospital; Yokosuka; Japan