Validity of Sildenafil Test in Patients with Pulmonary Arterial Hypertension Associated with Congenital Heart Disease According to Clinical and Echocardiographic Parameters - Molaei, Akbar; Aarabi Mogaddam, Mohammad Yusof; Nakhostin Davari, Paridokht; Shahmohammadi, Akbar; Meraji, Mahmood (The Research in Heart Yield and Translational Medicine (RHYTHM))