PT - JOURNAL ARTICLE AU - J E Otterstad TI - Measuring left ventricular volume and ejection fraction with the biplane Simpson’s method AID - 10.1136/heart.88.6.559 DP - 2002 Dec 01 TA - Heart PG - 559--560 VI - 88 IP - 6 4099 - http://heart.bmj.com/content/88/6/559.short 4100 - http://heart.bmj.com/content/88/6/559.full SO - Heart2002 Dec 01; 88