AL: acute leukemia; MDS: myelodysplastic syndrome; CML: chronic myeloid leukemia; NHL: Non-Hodgkin’s lymphoma; AA: aplastic anemia; HLA: human leukocyte antigen; MAC: myeloablative conditioning; NMAC: nonmyeloablative conditioning; ATG: antithymocyte globulin; GVHD: graft-versus-host disease; HBsAb: hepatitis B surface antibody