Out-of-Hospital cardiac arrest & SmartphonE RespOndErS trial (HEROES Trial): Methodology and study protocol of a pre-post-design trial of the effect of implementing a smartphon... by Michael P. Müller, Julian Ganter, Hans-Jörg Busch, Georg Trummer, Jörg Sahlmann, Florian Brettner, Maria Reden, Daniel Elschenbroich, Michael Preusch, Jonas Rusnak, Stephan Katzenschlager, Dirk Nauheimer, Robert Wunderlich, Jan-Steffen Pooth

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