Diagnostic accuracy of using capnography in verification of nasogastric tube placement among adult patients in hospital settings: Protocol of a diagnostic study by Janita Pak Chun Chau, Danny Wah Kun Tong, Suzanne Hoi Shan Lo, Savina Yee Man Sze, Molly Lai Mei Kwok, Peter Chi Keung Lai, Harris Kai Cheong Lam, Josephine Yuen Man Chung, Xu Liu, Wai Tong Chien, Kai Chow Choi

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