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Webb, Alastair John Stewart; Fischer, Urs; Rothwell, Peter Malcolm (2011). Effects of {beta}-blocker selectivity on blood pressure variability and stroke: A systematic review. Neurology, 77(8), pp. 731-737. Hagerstown, Md.: Lippincott Williams & Wilkins 10.1212/WNL.0b013e31822b007a