Evaluation of interventions to prevent vasovagal reactions among whole blood donors: rationale and design of a large cluster randomised trial by Amy McMahon, Stephen Kaptoge, Matthew Walker, Susan Mehenny, Philippe T Gilchrist, Jennifer Sambrook, Naim Akhtar, Michael Sweeting, Angela M Wood, Kathleen Stirrups, Ryan Chung, Sarah Fahle, Elisha Johnson, Donna Cullen, Rosemary Godfrey, Shannon Duthie, Louise Allen, Paul Harvey, Michael Berkson, Elizabeth Allen, Nicholas A Watkins, John R Bradley, Nathalie Kingston, Gail Miflin, Jane Armitage, David J Roberts, John Danesh, Emanuele Di Angelantonio

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