title: CPR before medical services arrive more than doubles survival after cardiac arrest.
authors.affiliation: London.
authors.forename: Susan
authors.initials: S
authors.lastname: Mayor
mesh_terms: D016887:Cardiopulmonary Resuscitation; D005260:Female; D006801:Humans; D008297:Male; D058687:Out-of-Hospital Cardiac Arrest / Q000628:therapy*