RT Journal Article SR Electronic T1 Correspondence on the debate regarding the haemodynamic definition of pulmonary hypertension JF European Respiratory Journal JO Eur Respir J FD European Respiratory Society SP 1900727 DO 10.1183/13993003.00727-2019 VO 53 IS 6 A1 Bradley A. Maron A1 Gaurav Choudhary A1 Ryan J. Tedford A1 Evan Brittain YR 2019 UL http://erj.ersjournals.com/content/53/6/1900727.abstract AB