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Sildenafil treatment for portopulmonary hypertension
F. Reichenberger, R. Voswinckel, E. Steveling, B. Enke, A. Kreckel, H. Olschewski, F. Grimminger, W. Seeger, H. A. Ghofrani
European Respiratory Journal 28 (3) 563-567; DOI: 10.1183/09031936.06.00030206 Published 31 August 2006