Defining the need for analgesia in the emergency department: protocol for an international Delphi process by Fiona C Sampson, Olivier Hugli, Christian H Nickel, Barbara Scotti, Anna Szczesna, Bojana Degen, Sandy Jean-Scherb, Lucrezia Rovati, Monika Kirsch, Gernot Mayer, Heike Thomys, Bruno Minotti

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