PT - JOURNAL ARTICLE AU - S. Spiekermann AU - K. Schenk AU - M. M. Hoeper TI - Increased xanthine oxidase activity in idiopathic pulmonary arterial hypertension AID - 10.1183/09031936.00013309 DP - 2009 Jul 01 TA - European Respiratory Journal PG - 276--276 VI - 34 IP - 1 4099 - http://erj.ersjournals.com/content/34/1/276.short 4100 - http://erj.ersjournals.com/content/34/1/276.full SO - Eur Respir J2009 Jul 01; 34