1 Department of Hematology/Oncology, Teikyo University School of Medicine, 2-11-2, Kaga, Itabashi-Ku, Tokyo, 173-8606, Japan.
2 Department of Central Laboratory, Teikyo University Hospital, Tokyo, Japan.
3 Department of Hematology/Oncology, Teikyo University School of Medicine, 2-11-2, Kaga, Itabashi-Ku, Tokyo, 173-8606, Japan. haruko-t@med.teikyo-u.ac.jp.