On pages 1299 and 1300 in the February 11, 2010, issue, there were errors in several figures. The legends for Figures 1, 2, 3, and 4 did not correspond with the correct images. In addition, incorrect figure files depicting data for patients 2 and 3 were uploaded to the Blood ftp site during submission. The errors were corrected in the online full-text version, which now differs from the print version.

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