The effect of sildenafil on pulmonary embolism-induced oxidative stress and pulmonary hypertension - Dias Júnior, Carlos A.; Costa, Debora C. Souza; Zerbini, Talita; Rocha, Joao Batista Teixeira da; Gerlach, Raquel F.; Santos, Jose E. Tanus (Anesthesia and Analgesia, 2005)