RT Journal Article SR Electronic T1 Postural sway in patients with syncope and poor orthostatic tolerance JF Heart JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 1688 OP 1689 DO 10.1136/hrt.2005.083907 VO 92 IS 11 A1 V E Claydon A1 R Hainsworth YR 2006 UL http://heart.bmj.com/content/92/11/1688.abstract AB