Efficacy of nasal clips combined with nasal cannulas in preventing hypoxemia during gastrointestinal endoscopy with sedation: a randomized controlled trial by Rui Lu, Haifei Xiang, Minshu Zhu, Yan Cao, Xiandong Shao, Guo Yu, Tao-Hsin Tung, Wenjie Du, Lingyang Chen, Jianbin Cao, Mingcang Wang

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