RT Journal Article SR Electronic T1 Head-up tilt testing. The balance of evidence. JF British Heart Journal JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 216 OP 217 DO 10.1136/hrt.72.3.216 VO 72 IS 3 A1 A D Hargreaves A1 O el Hag A1 N A Boon YR 1994 UL http://heart.bmj.com/content/72/3/216.abstract AB