Intermediate Dose of Imatinib In Combination with Chemotherapy Followed by Allogeneic Stem Cell Transplantation (SCT) Improves Early Outcome In Childhood Philadelphia Chromosome-Positive (Ph+) Acute Lymphoblastic Leukemia (ALL). Results of the Spanish Cooperative Group SHOP/SEHOP Studies SHOP 94, SHOP 99 and SHOP 05 | Publicación