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Optimal concentration of epidural fentanyl in bupivacaine 0.1% after thoracotomy C. N. H. Tan, A. Guha, N. D. A. Scawn, S. H. Pennefather, and G. N. Russell 开胸术后硬膜外0.;1%25布比卡因内芬太尼的最佳浓度