Perbandingan Hasil Penutupan Defek Septum Atrium Sekundum antara Transkateter Menggunakan Amplatzer Septal Occluder dengan Pembedahan = Comparison of Secundum Atrial Septal Defect Closure Between Transcatheter Closure using Amplatzer septal occluder with Surgery - Mazdar Helmy, author (2012)