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Saller, T.; MacLullich, A. M. J.; Schäfer, S. T.; Dossow, V. von; Hofmann-Kiefer, K. F.; Crispin, Alexander; Neitzert, R.; Schüle, C. (2019): Screening for delirium after surgery: validation of the 4 A's test (4AT) in the post-anaesthesia care unit. In: Anaesthesia