RecruitingPhase 2Drug trialOptimization of Post-transplantation Benadamustine and Cyclophosphamide in Patients With High-risk Myeloid Malignancies and a Partially Mismatched DonorOptimization of bendamustine-containg graft-versus-host disease (GVHD) prophylaxis to reduce the incidence of secondary haemophagocytic lymphohistiocytosis and GVHD