Bone Marrow Transplantation/adverse effects; Graft vs Host Disease/drug therapy; Immunosuppressive Agents/administration & dosage; Methylprednisolone/administration & dosage; Transplantation, Homologous/adverse effects; Actuarial Analysis; Acute Disease; Adolescent; Adult; Bone Marrow Transplantation/mortality; Cause of Death; Child; Child, Preschool; Cytomegalovirus Infections/etiology; Dose-Response Relationship, Drug; Female; Graft vs Host Disease/etiology; Hematologic Neoplasms/therapy; Histocompatibility; Humans; Hyperglycemia/chemically induced; Hypertension/chemically induced; Immunosuppressive Agents/adverse effects; Immunosuppressive Agents/therapeutic use; Infant; Infections/etiology; Italy; Male; Methylprednisolone/adverse effects; Methylprednisolone/therapeutic use; Middle Aged; Nuclear Family; Prospective Studies; Recurrence; Survival Analysis; Tissue Donors; Transplantation Conditioning; Transplantation, Homologous/mortality; Treatment Outcome