Sildenafil Therapy for Systolic Heart Failure with Secondary Pulmonary Hypertension: A Randomized Double-Blind, Placebo-Controlled Study by Lewis, Gregory D., Shahzad, Khurrham, Camuso, Janice, Martinovic, Maryann E., Shaw, Ravi V., Systrom, David M., Bloch, Kenneth D., Gerszten, Robert E., Semigran, Marc J.

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