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APA Citation
Passi, M., Vegesna, A., Whitson, M., Cheung, M., Worledge, H., Miller, L., & Roland, B. C. (n.d.). variations in pH Impedance Detection of Reflux Episodes in Patients With Atypical versus Typical Manifestations of Gastroesophageal Reflux Disease. American journal of gastroenterology, 112, . http://access.bl.uk/ark:/81055/vdc_100123020534.0x000035