Helmy, M., Djer, M., Pardede, S., Setyanto, D., Rundjan, L. and Sjakti, H. 2013. Comparison of surgical vs. non-surgical closure procedures for secundum atrial septal defect. Paediatrica Indonesiana. 53, 2 (Apr. 2013), 108-16. DOI:https://doi.org/10.14238/pi53.2.2013.108-16.