Comparison of Nasopharyngeal Airway with Endoscopic Respiratory Mask for Hypoxemia in Painless Gastrointestinal Endoscopy in Obese Outpatients: Study Protocol for a Randomized Cont... by Xiang D, Deng L, Zhou R, Zhang X, Tian L, Jiang W, Zhou Y, Chen W, Peng Y

Subjects: “…nasopharyngeal airway…”
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