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APA Citation
Armstrong, D., van Zanten, S. J. V., Chung, S. A., Shapiro, C. M., Dhillon, S., Escobedo, S., Chakraborty, B. K., Mann, V., Tanser, L., & Nevin, K. (2005). validation of a Short Questionnaire in English and French for Use in Patients with Persistent Upper Gastrointestinal Symptoms Despite Proton Pump Inhibitor Therapy: The Pass (Proton Pump Inhibitor Acid Suppression Symptom) Test. Canadian Journal of Gastroenterology, 19, 350–358. http://access.bl.uk/ark:/81055/vdc_100179857668.0x000032