Sildenafil for treatment of lung fibrosis and pulmonary hypertension: a randomised controlled trialHossein Ardeschir Ghofrani, Friedrich Grimminger, Werner Seeger et al.|The Lancet|2002Cited by 771
Combination Therapy with Oral Sildenafil and Inhaled Iloprost for Severe Pulmonary HypertensionHossein Ardeschir Ghofrani, Friedrich Grimminger, R. Wiedemann et al.|Annals of Internal Medicine|2002Cited by 503
Oral sildenafil as long-term adjunct therapy to inhaled iloprost in severe pulmonary arterial hypertensionHossein Ardeschir Ghofrani, Friedrich Grimminger, Frank Rose et al.|Journal of the American College of Cardiology|2003Cited by 368
Sildenafil for Long-Term Treatment of Nonoperable Chronic Thromboembolic Pulmonary HypertensionHossein Ardeschir Ghofrani, Friedrich Grimminger, Beate Enke et al.|American Journal of Respiratory and Critical Care Medicine|2003Cited by 286