RT Journal Article SR Electronic T1 A modified Valsalva manoeuvre results in greater termination of supraventricular tachycardia than standard Valsalva manoeuvre JF Evidence Based Medicine JO Evid Based Med FD BMJ Publishing Group Ltd SP 61 OP 61 DO 10.1136/ebmed-2015-110357 VO 21 IS 2 A1 Gavin D Smith YR 2016 UL http://ebm.bmj.com/content/21/2/61.abstract AB