[1] Yokohama City Univ, Grad Sch Med, Internal Med & Clin Immunol, Yokohama, Kanagawa 232, Japan
[2] Yokosuka City Hosp, Hematol, Yokosuka, Kanagawa, Japan
[3] Fujisawa City Hosp, Hematol Immunol, Fujisawa, Kanagawa, Japan
[4] Kanagawa Canc Ctr, Med Oncol, Yokohama, Kanagawa 2410815, Japan
[5] Yokohama City Univ, Hematol, Med Ctr, Yokohama, Kanagawa 232, Japan
[6] Yamato Municipal Hosp, Hematol Oncol, Yamato, Japan
[7] Yokohama Ekisaikai Hosp, Internal Med, Yokohama, Kanagawa, Japan
[8] Shizuoka Red Cross Hosp, Hematol, Shizuoka, Japan
[9] Saiseikai Yokohama Nanbu Hosp, Hematol, Yokohama, Kanagawa, Japan