RT Journal Article SR Electronic T1 Primary pulmonary hypertension JF Thorax JO Thorax FD BMJ Publishing Group Ltd and British Thoracic Society SP 1107 OP 1118 DO 10.1136/thx.54.12.1107 VO 54 IS 12 A2 A E Tattersfield A2 R M du Bois A1 A J Peacock YR 1999 UL http://thorax.bmj.com/content/54/12/1107.abstract AB