A randomized controlled trial of postoperative intravenous acetaminophen plus thoracic epidural analgesia vs. thoracic epidural analgesia alone after gastrectomy for gastric cancer.

"Conflict of interest The authors declare that they have no conflict of interest."

"This study was supported by the Digestive Disease Support Organization (DDSO). The authors would like to acknowledge significant support of Prof. T.Taniguchi at the Department of Anesthesiology and Intensive Care Medicine, Kanazawa University. The authors thank junior and senior members of the anesthesia and surgical team who were implicated in patients’ recruitment and follow-up. The authors also thank the Edanz Group (http://www.edanzediting.com/ac) for editing a draft of this manuscript."

"The study followed the principles of the Declaration of Helsinki and was approved by institutional review boards and independent ethics committees at all participating institutions. The trial was registered under UMIN (Trial no. 000022710) before patient recruitment was started."