Amelia, P., Department of Child Health, Faculty of Medicine, Universitas Sumatera Utara, Indonesia; Djer, M.M., Department of Child Health, Faculty of Medicine, Universitas Indonesia, Indonesia; Advani, N., Department of Child Health, Faculty of Medicine, Universitas Indonesia, Indonesia; Sukardi, R., Center of Integrated Cardiac Service, Dr. Cipto Mangunkusumo Hospital, Jakarta, Indonesia; Waworuntu, D.S., Department of Child Health, Faculty of Medicine, Universitas Sam Ratulangi, Indonesia