Ethics approval
This manuscript does not involve experiments on human participants, human data, or human tissue. Ethics approval for the anonymous survey was waived by the institutional ethics board because the survey was anonymous (Waiver letter No 20-1279, issued by the University of Freiburg Ethics Committee, Chair Prof. Dr. R. Korinthenberg).
Consent for publication
Figure 1 contains an image of Julian Ganter, who is among the authors of the paper. He gave his consent for publication and is ready to submit a consent form. His informed consent for publication of identifying information/images in this online open-access publication is included. Photographs in the supplement contain images from this same author, as well as a second author from this manuscript, Klemens Baldas. He gave his consent for publication and is ready to submit a consent form. His informed consent for publication of identifying information/images in this online open-access publication is included.
Availability of data and materials
The datasets generated during and/or analysed during the current study are not publicly available. They are stored in the FirstAED software backend in the dispatch center in Freiburg/ Germany. Anonymized datasets are available from the corresponding author on reasonable request.
Competing interests
GT is board member (secretary) in the German Resuscitation Council (GRC), board member of the charity organization “Region of Lifesavers” (RDL), which is responsible to operate the SAS, and shareholder of Resuscitec GmbH, Freiburg/ Germany.
MPM is member of the executive committee of the GRC, chair of the charity organization “Region of Lifesavers” (RDL), which is responsible to operate the SAS, and shareholder of SmartResQ ApS, Svendborg/ Denmark.
HJB and KB are board members of the charity organization “Region of Lifesavers” (RDL), which is responsible to operate the SAS.
DD, JG, and MH have no competing interests to declare.
Funding
We received public (City of Freiburg, District of Breisgau-Hochschwarzwald) and private funding for the project.
Authors´ contributions
JG: Conception of the study, analysis of the data, drafting the article
DD: Design, analysis of the data, revising the manuscript critically
GT: Design and conception of the study, interpretation of the data, drafting the manuscript
HJB: Conception, interpretation of the data, revising the manuscript
KB: Conception, interpretation of the data, revising the manuscript
MPM: Conception and design, interpretation of the data, drafting and revising the manuscript critically
MH: Conception of the questionnaire, interpretation of the data, and revising the manuscript critically
All authors gave their final approval of the version to be submitted.
Acknowledgements
We are extremely grateful for the outstanding support of more than 1,000 enthusiastic voluntary first responders, who give their best to save lives, at daytime or at night, and even under pandemic conditions.