Who will take informed consent? {26a}
fainting
We have followed the guidance of the Ottawa Statement on the Ethical Design and Conduct of Cluster Randomized Trial [To avoid biases that could undermine the interpretation of study results (e.g. greater awareness of fainting that could result in “social contagion” or other group triggers that lead to increasing fainting), we have not individually informed blood donors about the trial’s specific aim to investigate strategies to reduce VVRs [