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APA Citation
Abdelhafez, M., Phillip, V., Hapfelmeier, A., Elnegouly, M., Poszler, A., Strobel, K., Born, P., Dollhopf, M., Kassem, A. M., Calavrezos, L., Klare, P., Schlag, C., Bajbouj, M., Schmid, R. M., & von Delius, S. (2017). cap Assisted Upper Endoscopy for Examination of the Major Duodenal Papilla: A Randomized, Blinded, Controlled Crossover Study (CAPPA Study). American journal of gastroenterology, 112, . http://access.bl.uk/ark:/81055/vdc_100122853151.0x00005f