Arunotai Siriussawakul, MD, Sukanya Jirachaipitak, Jatuporn Thonsontia, Kloyjai Kanjanarai, MD, Mallika Ahuka, Piyawadee Buaumphai, RN, Anchala Jirakulsawat, RN, Sutatip Waanchiang, Vimolluck Sanansilp, Acute Pain after Upper Abdominal Surgery in Post-Anesthesia Care Unit, International Journal of Management Sciences and Business Research 08(2013):06-13 DOI: 10.5281/zenodo.3413062