^Karanes C, Nelson GO, Chitphakdithai P, Agura E, Ballen KK, Bolan CD, Porter DL, Uberti JP, King RJ, Confer DL. Twenty years of unrelated donor hematopoietic cell transplantation for adult recipients facilitated by the National Marrow Donor Program. Biology of Blood and Marrow Transplantation. 2008, 14 (9 Suppl): 8–15. PMID 18721775. doi:10.1016/j.bbmt.2008.06.006.