CLINICAL OBSERVATIONS, INTERVENTIONS, AND THERAPEUTIC TRIALS Allogeneic Stem Cell Transplantation for Agnogenic Myeloid Metaplasia: A European Group for Blood and Marrow Transplantation, SocieteFrancaise de Greffe de Moelle, Gruppo Italiano per il Trapianto del Midollo Osseo, and Fred Hutchinson Cancer Research Center Collaborative Study