[1] Hokkaido Univ, Dept Hematol, Fac Med, Sapporo, Hokkaido, Japan
[2] Sapporo City Gen Hosp, Dept Hematol, Sapporo, Hokkaido, Japan
[3] Hakodate Municipal Hosp, Hakodate, Hokkaido, Japan
[4] Tonan Hosp, Sapporo, Hokkaido, Japan
[5] Japanese Red Cross Kitami Hosp, Kitami, Hokkaido, Japan
[6] Aiiku Hosp, Sapporo, Hokkaido, Japan
[7] Sapporo Hokuyu Hosp, Dept Hematol, Sapporo, Hokkaido, Japan
[8] Teine Keijinkai Hosp, Sapporo, Hokkaido, Japan
[9] Kin Ikyo Chuo Hosp, Sapporo, Hokkaido, Japan
[10] Kushiro Rosai Hosp, Kushiro, Japan
[11] Asahikawa Municipal Hosp, Asahikawa, Hokkaido, Japan
[12] Natl Hosp Org Hokkaido Canc Ctr, Dept Hematol, Sapporo, Hokkaido, Japan
[13] Obihiro Kosei Gen Hosp, Obihiro, Hokkaido, Japan
[14] Sapporokousei Gen Hosp, Sapporo, Hokkaido, Japan
[15] Hokkaido Univ Hosp, Dept Hematol, Sapporo, Hokkaido, Japan