DOI: 10.1055/s-00000085

The Thoracic and Cardiovascular Surgeon

References

Sastry BK, Narasimhan C, Reddy NK, Raju BS.
Clinical efficacy of sildenafil in primary pulmonary hypertension: a randomized, placebo-controlled, double-blind, crossover study. 
J Am Coll Cardiol 2004; 43: 1149-1153  

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