Impacts of chest compression cycle length and real-time feedback with a CPRmeter® on chest compression quality in out-of-hospital cardiac arrest: study protocol for a multicenter r... oleh Clément Buléon, Jean-Jacques Parienti, Elodie Morilland-Lecoq, Laurent Halbout, Eric Cesaréo, Pierre-Yves Dubien, Benoit Jardel, Christophe Boyer, Kévin Husson, Florian Andriamirado, Xavier Benet, Emmanuel Morel-Marechal, Antoine Aubrion, Catalin Muntean, Erwan Dupire, Eric Roupie, Hervé Hubert, Christian Vilhelm, Pierre-Yves Gueugniaud, on behalf of the CILICA-HS study group