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20. Eikelboom JW, Kearon C, Guyatt G, Sessler DI, Yusuf S, Cook D, et al. Perioperative aspirin for prevention of venous thromboembolism. The PeriOperative ISchemia Evaluation-2 Trial and a pooled analysis of the randomized trials. Anesthesiology. 2016;125:1121-9.