Hi,
I don't have the answer to your question, but I inform you that Dr. Pietro Sodani (Cure Thalassemia scientific coordinator) in case of HLA matched sibling suggests to use the bone marrow and not the cord blood.
The reason is that with the bone marrow there is a lower risk both of rejection and to have a graft-versus-host disease (GVHD).
Furthermore, in the bone marrow there is usually a greater number of stem cells useful for the transplant.