RT Journal Article SR Electronic T1 Treatment of pulmonary hypertension secondary to connective tissue diseases JF Thorax JO Thorax FD BMJ Publishing Group Ltd and British Thoracic Society SP 273 OP 277 DO 10.1136/thx.54.3.273 VO 54 IS 3 A1 Olivier Sanchez A1 Marc Humbert A1 Olivier Sitbon A1 GĂ©rald Simonneau YR 1999 UL http://thorax.bmj.com/content/54/3/273.abstract AB