Vitayaburananont, P. and Nuchpramool, P. 2020. Assess Level of Post-operative Pain in Adult Patients who Underwent Elective Surgery Using Pre-printed Postoperative Pain Order in Vajira Hospital. Vajira Medical Journal : Journal of Urban Medicine. 64, 2 (Apr. 2020), 125–132. DOI:https://doi.org/10.14456/vmj.2020.12.