Randomization and intervention
Eligible patients were randomly assigned by the research team, in a 1:1 ratio, either to the control group or the high vit D (intervention) group on the day of admission for aHSCT using permuted blocks of four with stratification by conditioning regimen (myeloablative vs. reduced intensity). Participants were not informed of the intervention assignment. Patients in the control group received our standard 2,000 IU (JAMP Pharma, CA) vit D