The addition of tramadol to morphine via patient-controlled analgesia does not lead to better post-operative pain relief after total knee arthroplasty

Stiller, C.-O. ; Lundblad, H. ; Weidenhielm, L. ; Tullberg, T. ; Grantinger, B. ; Lafolie, P. ; Jansson, K.-Å.

Acta anaesthesiologica Scandinavica, 2007-03, Vol.51 (3), p.322-330 [Periódico revisado por pares]

Oxford, UK: Blackwell Publishing Ltd

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