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POSTOPERATIVE ANALGESIC EFFICACY OF EPIDURAL MORPHINE IN PATIENTS UNDERGOING CESAREAN SECTION, HOSPITAL ALFREDO G. PAULSON. NOVEMBER AND DECEMBER 2019. AM/EC [Internet]. 2020 Dec. 31 [cited 2026 Apr. 28];30(2):77-83. Available from: https://actasmedicas.ec/index.php/am/article/view/40