RT Journal Article SR Electronic T1 Techniques for comprehensive two dimensional echocardiographic assessment of left ventricular systolic function JF Heart JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP iii2 OP iii8 DO 10.1136/heart.89.suppl_3.iii2 VO 89 IS suppl 3 A1 T H Marwick YR 2003 UL http://heart.bmj.com/content/89/suppl_3/iii2.abstract AB