Postoperative Pain in Patients Undergoing Cancer Surgery and Intravenous Patient-Controlled Analgesia Use: The First and Second 24 h Experiences.

"Disclosures Xiaohong Chen, Jiazhen Yao, Yirong Xin, Genshan Ma, Yan Yu, Yuan Yang, Xiaochen Shu and Hanzhong Cao declare that they have no conflict of interest."

"Funding This study was jointly funded by the Social development-Clinical Frontier Technology Project of China Jiangsu Provincial Department of Science and Technology (BE2018669); the Health Research Funds of Nantong, China (2020JCC046); General program from Nantong Commission of Health (MB2021050); Scientific Research Foundation for Talented Scholars in Soochow University, China; Suzhou medical and industrial integration collaborative innovation research project (Project number SLJ202012); Suzhou clinical trial institution capacity enhancement project (Project number SLT202003); The Nuclear Energy Development Project, China (Project number 2016-1295); and A Project of the Priority Academic Program Development of Jiangsu Higher Education Institutions China. The Rapid Service Fee was funded by the authors."