%0 Journal Article %T Design and implementation of a large and complex trial in emergency medical services %A Barnaby C. Reeves %A Chris A. Rogers %A In collaboration with the AIRWAYS-2 study team %A Jerry P. Nolan %A Jodi Taylor %A Jonathan R. Benger %A Madeleine Clout %A Maria J. Robinson %A Matthew Thomas %A Sarah Voss %A Stephen J. Brett %J Archive of "Trials". %D 2019 %R 10.1186/s13063-019-3203-0 %X The online version of this article (10.1186/s13063-019-3203-0) contains supplementary material, which is available to authorized users %K Out-of-hospital cardiac arrest %K Cardiopulmonary resuscitation %K Emergency medical services %K Research design %U https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6368693/