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Clinics (Sao Paulo). 2010 Apr; 65(4): 393–400. Effects of sildenafil on autonomic nervous function during sleep in obstructive sleep apnea Christiane Neves,I,II Sérgio Tufik,I Felipe Chediek,I Dalva Poyares,I Fátima Cintra,I Marina Roizenblatt,I Fabiano Abrantes,I Marina Ariza Monteiro,I and...