RT Journal Article SR Electronic T1 Physical counterpressure manoeuvres reduced vasovagal syncope JF Evidence Based Medicine JO Evid Based Med FD BMJ Publishing Group Ltd SP 44 OP 44 DO 10.1136/ebm.12.2.44 VO 12 IS 2 YR 2007 UL http://ebm.bmj.com/content/12/2/44.abstract AB