RT Journal Article SR Electronic T1 Examination of the heart in supine and left lateral positions. JF British Heart Journal JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 902 OP 907 DO 10.1136/hrt.35.9.902 VO 35 IS 9 A1 Bethell, H J A1 Nixon, P G YR 1973 UL http://heart.bmj.com/content/35/9/902.abstract AB