RT Journal Article SR Electronic T1 Provocative testing of the pulmonary circulation: advances and unresolved issues JF European Respiratory Journal JO Eur Respir J FD European Respiratory Society SP 18 OP 20 DO 10.1183/13993003.00860-2016 VO 48 IS 1 A1 Lau, Edmund M. A1 Naeije, Robert YR 2016 UL http://erj.ersjournals.com/content/48/1/18.abstract AB