RT Journal Article SR Electronic T1 Initial triple therapy in pulmonary arterial hypertension: coming of age and rejuvenated JF European Respiratory Journal JO Eur Respir J FD European Respiratory Society SP 2004258 DO 10.1183/13993003.04258-2020 VO 57 IS 1 A1 Harm Jan Bogaard A1 Olivier Sitbon YR 2021 UL http://erj.ersjournals.com/content/57/1/2004258.abstract AB