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Scaramozzino, Pasquale, Curatolo, Michele, Fischer, Michele, Petersen-Felix, S. and Zbinden, A.M. (1998) 'Epidural Fentanyl, Epinephrine and Clonidine as Adjuvants to Local Anesthetics for Surgical Analgesia: Meta-Analysis of Analgesia and Side-Effects.' Acta Anaesthesiologica Scandinavica, 42. pp. 910-920.