RT Journal Article SR Electronic T1 The extents of mitral leaflet opening and closure are determined by left ventricular systolic function JF Heart JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 126 OP 128 DO 10.1136/hrt.2003.014373 VO 90 IS 2 A1 S Kaul YR 2004 UL http://heart.bmj.com/content/90/2/126.abstract AB