5:
Sildenafil improves exercise capacity and quality of life in patients with systolic heart failure and secondary pulmonary hypertension.
Lewis GD, Shah R, Shahzad K, Camuso JM, Pappagianopoulos PP, Hung J, Tawakol A, Gerszten RE, Systrom DM, Bloch KD, Semigran MJ.
Circulation. 2007 Oct 2;116(14):1555-62. Epub 2007 Sep 4.
PMID: 17785618 [PubMed - indexed for MEDLINE]
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