Efficacy of ultrasound-guided external oblique plane block for postoperative analgesia after upper abdominal surgeries
1.Department of Anesthesiology, Zhongshan Hospital of Traditional Chinese Medicine, Guangdong
Province, Zhongshan 528400, China; 2.Department of Anesthesiology, Southern Medical University
Nanfang Hospital, Guangdong Province, Guangzhou 510400, China