Diphenhydramine as an adjunct to sedation for colonoscopy: a double-blind randomized, placebo controlled study by Tu, Raymond H., MD, Grewall, Pam, MD, Leung, Joseph W., MD, FRCP, FACP, FACG, Suryaprasad, Arun G., MD, Sheykhzadeh, Paul I., DO, Doan, Caitlin, MD, Garcia, Juan Carlos, MD, Zhang, Nan, MS, Prindiville, Thomas, MD, Mann, Surinder, MD, Trudeau, Walter, MD

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