RT Journal Article SR Electronic T1 Vasodilators in the treatment of primary pulmonary hypertension JF European Respiratory Journal JO Eur Respir J FD European Respiratory Society SP 263 OP 264 DO 10.1183/09031936.98.12020263 VO 12 IS 2 A1 EK Weir A1 B Schremmer YR 1998 UL http://erj.ersjournals.com/content/12/2/263.abstract AB