A comparison of the relative effectiveness of intravenous patient controlled-analgesia delivered morphine and morphine with fentanyl
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A. Concejero | B. Jawan | W. Chou | Chien-Hui Yang | Kuan-Hung Chen | C. Wang | K. Cheng | Cheng-Huang Wang | Chia-Jung Huang | Chih-Shien Wang | K. Chang | K. Lin | C.-C. Wang