RT Journal Article SR Electronic T1 Pulmonary arterial hypertension: combination therapy in the modern management era JF European Respiratory Review JO EUROPEAN RESPIRATORY REVIEW FD European Respiratory Society SP 348 OP 349 DO 10.1183/09059180.00008310 VO 19 IS 118 A1 O. Sitbon YR 2010 UL http://err.ersjournals.com/content/19/118/348.abstract AB