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Wang YJ, Lang XQ, Wu D, He YQ, Lan CH, Xiao X, Wang B, Zou DW, Wu JM, Zhao YB, Dettmar PW, Chen DF, , Yang M.  Salivary Pepsin as an Intrinsic Marker for Diagnosis of Sub-types of Gastroesophageal Reflux Disease and Gastroesophageal Reflux Disease-related Disorders.  Journal of Neurogastroenterology and Motility 2020;26:74-84.  https://doi.org/10.5056/jnm19032