Correction to: Leukemia (2009) 23, 492–500; doi:10.1038/ leu.2008.365; published online 8 January 2009

Since the publication of this paper, the authors have noted that the affiliation for author ‘L Lecchi’ is incorrect.

The correct affiliation is Milano Cord Blood Bank, Fondazione Ospedale Maggiore Policlinico, Mangiagalli e Regina Elena, Italy.

The Authors would like to apologize for this error.