Sanansilp, V., Rasmidatta, V., Tangkitngamwong, P., & Pongphantarak, S. (2006). Comparison of Intravenous vs. Intramuscular Morphine for Postoperative Pain Relief on the Multidisciplinary Care Path Implemented Ward. Siriraj Medical Journal, 58(12), 1216–1221. retrieved from https://he02.tci-thaijo.org/index.php/sirirajmedj/article/view/246012