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Zaugg, M; Bestmann, L; Wacker, J; Lucchinetti, E; Boltres, A; Schulz, C; Hersberger, M; Kälin, G; Furrer, L; Hofer, C; Blumenthal, S; Müller, A; Zollinger, A; Spahn, D R; Borgeat, A (2007). Adrenergic receptor genotype but not perioperative bisoprolol therapy may determine cardiovascular outcome in at-risk patients undergoing surgery with spinal block: the Swiss Beta Blocker in Spinal Anesthesia (BBSA) study: a double-blinded, placebo-controlled, multicenter trial with 1-year follow-up. Anesthesiology, 107(1):33-44.