RT Journal Article SR Electronic T1 Is the time constant of the pulmonary circulation truly constant? JF European Respiratory Journal JO Eur Respir J FD European Respiratory Society SP 1541 OP 1542 DO 10.1183/09031936.00174213 VO 43 IS 5 A1 Robert Naeije A1 Marion Delcroix YR 2014 UL http://erj.ersjournals.com/content/43/5/1541.abstract AB