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Böttiger, Bernd W; Bernhard, Michael; Knapp, Jürgen; Nagele, Peter (2016). Influence of EMS-physician presence on survival after out-of-hospital cardiopulmonary resuscitation: systematic review and meta-analysis. Critical care, 20(1), p. 4. BioMed Central 10.1186/s13054-015-1156-6
