Statistics of Mitoxantrone Versus Daunorubicin in Induction-Consolidation Chemotherapy - The Value of Low-Dose Cytarabine for Maintenance of Remission, and an Assessment of Prognostic Factors in Acute Myeloid Leukemia in the Elderly : Final Report of the Leukemia Cooperative Group of the European Organization for the Research and Treatment of Cancer and th Dutch-Belgian Hemato-Oncology Cooperative Hovon Group Randomized Phase III Study AML-9