(1)
Privado, M. S.; Issy, A. M.; Lanchote, V. L.; Garcia, J. B. S.; Sakata, R. K. Epidural Versus Intravenous Fentanyl for Postoperative Analgesia Following Orthopedic Surgery: Randomized Controlled Trial. Sao Paulo Med J 2010, 128, 5-9.