PT - JOURNAL ARTICLE AU - Michael D. McGoon TI - Upfront triple therapy for pulmonary arterial hypertension: is three a crowd or critical mass? AID - 10.1183/09031936.00039314 DP - 2014 Jun 01 TA - European Respiratory Journal PG - 1556--1559 VI - 43 IP - 6 4099 - http://erj.ersjournals.com/content/43/6/1556.short 4100 - http://erj.ersjournals.com/content/43/6/1556.full SO - Eur Respir J2014 Jun 01; 43