RT Journal Article SR Electronic T1 PRIMARY PULMONARY HYPERTENSION JF British Heart Journal JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 305 OP 311 DO 10.1136/hrt.12.3.305 VO 12 IS 3 A1 W. D. Brinton YR 1950 UL http://heart.bmj.com/content/12/3/305.abstract AB