RT Journal Article SR Electronic T1 Non invasive assessment of pulmonary hypertension severity and disease progression JF Heart JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 1196 OP 1197 DO 10.1136/hrt.2011.222471 VO 97 IS 15 A1 Philip J Kilner YR 2011 UL http://heart.bmj.com/content/97/15/1196.abstract AB