Hiroshima University - Department of Hematology and Oncology, Kurashiki Central Hospital, Yokohama City University - Medical Center, NTT Medical Center Tokyo - Department of Hematology, Hiroshima City North Medical Center Asa Citizens Hospital, Hyogo Medical University, Iwate Medical University, Iwate Prefectural Central Hospital, Osaka Metropolitan University, Asahikawa Medical University, Ome Municipal General Hospital, Otsu Red Cross Hospital - Department of Hematology and Immunology, Saga University, Saga University, Osaka City General Hospital, Kyoto University, Sapporo Medical University, Asahikawa Kosei Hospital - Department of Hematology Oncology, Kyoto Prefectural University of Medicine, Panasonic Health Insurance Organization Matsushita Memorial Hospital - Department of Hematology, Fukushima Medical University, Fukushima Medical University, Saga University - Center for Comprehensive Community Medicine and Saga University