“ Sildenafil Preserves Diastolic Relaxation After Reduction by L-NAME and Increases Phosphodiesterase-5 in the Intercalated Discs of Cardiac Myocytes and Arterioles ”. 2011. Clinics 66 (7): 1253-58. https://doi.org/10.1590/S1807-59322011000700022.