Parasympathetic Tone Activity Evaluation to Discriminate Ketorolac and Ketorolac/Tramadol Analgesia Level in Swine
          Ferreira, Fátima; Avelino, Catarina P.; Sánchez-Margallo, Francisco M.; Antunes, Luís  
          
          Anesthesia & Analgesia,  Vol. 129 No. 3  (2019), 882-889  
          https://journals.lww.com/anesthesia-analgesia/Fulltext/2019/09000/Parasympathetic_Tone_Activity_Evaluation_to.39.aspx  
           
            
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