European first responder systems and differences in return of spontaneous circulation and survival after out-of-hospital cardiac arrest: A study of registry cohorts by Iris Oving, MSc, Corina de Graaf, MD, MSc, Siobhan Masterson, PhD, Rudolph W. Koster, MD, PhD, Aeilko H. Zwinderman, PhD, Professor, Remy Stieglis, MSc, Hajriz AliHodzic, MD, PhD, Enrico Baldi, MD, Susanne Betz, MD, PhD, Diana Cimpoesu, MD, PhD, Professor, Fredrik Folke, MD, PhD, Professor, Dennis Rupp, Federico Semeraro, MD, Anatolij Truhlar, MD, PhD, Hanno L. Tan, MD, PhD, Marieke T. Blom, PhD

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