The authors regret that there was an error in Section 3.3, paragraph 2 of the above paper. The following sentence is incorrect:
Time to recurrence was 17 months in patients who had undergone a transfusion compared with 11 months for those who had not (p = 0.03).
The correct sentence is:
Time to recurrence was 11 months in patients who had undergone a transfusion compared with 17 months for those who had not (p = 0.03).
The online version has been updated.
The authors would like to apologise for any inconvenience caused.