Siriket , . R. . ., S. . Pairojkul, P. . Piasupun, and S. . Saidum. “A Protocol for Morphine Subcutaneous Administration at Home in Dying Patient”. Srinagarind Medical Journal, vol. 36, no. 3, June 2021, pp. 353-7, https://li01.tci-thaijo.org/index.php/SRIMEDJ/article/view/251232.