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Combination of olanzapine with bispectral index guided anesthesia to prevent postoperative delirium in elderly patients undergoing major gastrointestinal elective surgery: a randomized, double-blind, placebo-controlled study protocol. PPCR [Internet]. 2021 Nov. 5 [cited 2024 Nov. 23];7(3):35-42. Available from: https://journal.ppcr.org/index.php/ppcrjournal/article/view/156