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Contributors All authors contributed to the original Cochrane review and have approved this Cochrane Corner article.
Funding Supported by NHS Blood and Transplant, Research and Development, UK, the William Harvey Research Institute, UK, and the Oxford Biomedical Research Centre Programme.
Competing interests AM was the chief investigator of four included studies and is the lead investigator of the ongoing BAMI trial.
Provenance and peer review Commissioned; internally peer reviewed.