ภมรพล ศิริพรรณ, and นุ่มพูล จารุณี. 2019. “Factors Predicting Constipation in Critically Ill Patients”. The Journal of Thailand Nursing and Midwifery Council 34 (1):88-103. https://he02.tci-thaijo.org/index.php/TJONC/article/view/152511.