A site report form (SRF) will also be filled by each participating center to document its transfusion protocol such as the type of blood products used for HSCT, leukoreduction, type of red blood cells (RBCs) (washed, irradiated, CMV negative, etc.), type of plasma (fresh frozen plasma, frozen plasma, solvent detergent plasma), type of platelet concentrates (apheresis, pooled, etc,), maximum length of storage (days), etc.