The Optimal Concentration of Alfentanil in Combination with 0.15% Ropivacaine for Postoperative Patient-Controlled Epidural Analgesia.
Sung Mi Hwang, Hyun Hak Ko, Jae Jun Lee, So Young Lim, Il Young Chung
Korean J Anesthesiol. 2006;51(2):185-189.     DOI:
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Re: The optimal concentration of alfentanil in combination with 0.15% ropivacaine
Kyung Bong Yoon, Yang Sik Shin
Korean Journal of Anesthesiology.2007; 52(2): 252.     CrossRef