496: Postoperative Analgesia After Major Abdominal Surgery: Comparison Between Patient Controlled Epidural Ropivacaine, Patient Controlled i.v. Morphine and Epidural Morphine
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496: Postoperative Analgesia After Major Abdominal Surgery: Comparison Between Patient Controlled Epidural Ropivacaine, Patient Controlled i.v. Morphine and Epidural Morphine
Fyntanidou, B; Vaidis, G; Tsaprali, V; Georgiou, M; Andreou, A; Savidou, A; Kyparissa, M; Lazaridou, A; Papanikolaou, G