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Vladimiro L. Vida,
Guillermo Gaitan,
Emilio Quezada,
Joaquin Barnoya
and Aldo R. Castañeda
(2007).
Low-dose oral sildenafil for patients with pulmonary hypertension: a cost-effective solution in countries with limited resources. Cardiology in the Young,
17
,
pp 72-77
doi:10.1017/S1047951106001193