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APA Citation
Ding, Z., Wang, K., Wang, B., Zhou, N., Li, H., & Yan, B. (2016). efficacy and tolerability of oxycodone versus fentanyl for intravenous patient-controlled analgesia after gastrointestinal laparotomy. Medicine, 95(39), e4943–. http://access.bl.uk/ark:/81055/vdc_100036529918.0x000044