A look at Denmark's Heartrunner app, which sends one of 100K+ first responder volunteers to nearby cardiac emergencies, who often arrive before ambulances (Martin Selsoe Sorensen/Washington Post)

Martin Selsoe Sorensen / Washington Post:
A look at Denmark's Heartrunner app, which sends one of 100K+ first responder volunteers to nearby cardiac emergencies, who often arrive before ambulances  —  Denmark has seen a dramatic increase in survival from heart attacks after it began recruiting volunteers and arming …

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