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Long-term treatment with sildenafil in chronic thromboembolic pulmonary hypertension
F. Reichenberger, R. Voswinckel, B. Enke, M. Rutsch, E. El Fechtali, T. Schmehl, H. Olschewski, R. Schermuly, N. Weissmann, H. A. Ghofrani, F. Grimminger, E. Mayer, W. Seeger
European Respiratory Journal 30 (5) 922-927; DOI: 10.1183/09031936.00039007 Published 31 October 2007