PT - JOURNAL ARTICLE AU - R. Naeije TI - Breathing more with weaker respiratory muscles in pulmonary arterial hypertension AID - 10.1183/09031936.04.00121004 DP - 2005 Jan 01 TA - European Respiratory Journal PG - 6--8 VI - 25 IP - 1 4099 - http://erj.ersjournals.com/content/25/1/6.short 4100 - http://erj.ersjournals.com/content/25/1/6.full SO - Eur Respir J2005 Jan 01; 25