Suraseranivongse, S., S. Valairucha, M. Laohapensang, R. Ruangtrakul, S. Saleepanth, R. Kaosaard, and P. Sirirutbunkajal. “Comparison of Morphine Given by An Intravenous Sliding Scale or by Intramuscular Route for Postoperative Pain Relief in Pediatric Patients : An Interim Analysis”. Siriraj Medical Journal, vol. 55, no. 8, Aug. 2003, pp. 465-72, https://he02.tci-thaijo.org/index.php/sirirajmedj/article/view/245437.