RT Journal Article SR Electronic T1 Improving echocardiographic estimation of pulmonary vascular resistance JF Heart JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 782 OP 782 DO 10.1136/hrt.2011.223735 VO 97 IS 9 A1 Corrado Magnino A1 Alberto Milan A1 Franco Veglio YR 2011 UL http://heart.bmj.com/content/97/9/782.1.abstract AB