Date	Event	Description
27 May 2016	New search has been performed	We made the following changes: 1) added 16 new trials; 2) used 30‐day mortality as the primary outcome because mortality is a more clinically relevant outcome and the number of participants enrolled in the trials provided sufficient power to examine this outcome; 3) added sensitivity analyses to evaluate heterogeneity for transfusion outcomes between trials; 4) changed authors.
27 May 2016	New citation required and conclusions have changed	The conclusions of the review have changed, and the search date is now 27 May 2016.