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APA Citation
Cheung, J., Goodman, K. J., Bailey, R., Fedorak, R. N., Morse, J., Millan, M., Guzowski, T., & van Zanten, S. V. (2010). a Randomized Trial of Topical Anesthesia Comparing Lidocaine Versus Lidocaine Plus Xylometazoline for Unsedated Transnasal Upper Gastrointestinal Endoscopy. Canadian Journal of Gastroenterology, 24, 317–321. http://access.bl.uk/ark:/81055/vdc_100179856680.0x000042