Gupta, et al.. Descriptive Analysis of Changing Toxicity Profiles for 30 and 100 Day Mortality After Matched Related Donor (MRD) Allogeneic (allo) Hematopoietic Stem Cell Transplantation (HSCT) Using Po Vs Iv Busulfan (BU) Based Conditioning Regimens. Elsevier BV, 2005, doi:10.1016/j.bbmt.2004.12.085.