RT Journal Article SR Electronic T1 Preoperative treatment with β-blockers is associated with elevated postoperative mortality and cardiac morbidity in patients with uncomplicated hypertension undergoing non-cardiac surgery JF Evidence Based Medicine JO Evid Based Med FD BMJ Publishing Group Ltd SP 114 OP 115 DO 10.1136/ebmed-2016-110395 VO 21 IS 3 A1 Wijeysundera, Duminda N YR 2016 UL http://ebm.bmj.com/content/21/3/114.abstract AB