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Efficacy of 1, 5, and 20 mg oral sildenafil in the treatment of adults with pulmonary arterial hypertension: a randomized, double-blind study with open-label extension

Crossref DOI link: https://doi.org/10.1186/s12890-017-0374-x

Published Online: 2017-02-23

Published Print: 2017-12

Update policy: https://doi.org/10.1007/springer_crossmark_policy

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