In “Acknowledgments” on page 3013, some grant acknowledgments were omitted. The following statement should have been included: “The study was also partly supported by Medical Research Council grants MR/S021140/1 and MR/R009341/1 and the National Institute for Health Research Blood and Transplant Research Unit in Red Cell Products (IS-BTU-1214-10032).”

In addition, the following statement should appear at the end of “Acknowledgments”: “The views expressed are those of the authors and not necessarily those of the National Health Service, the National Institute for Health Research, or the Department of Health and Social Care.”

The errors have been corrected in the published article.