Department of Child Health, Faculty of Medicine, Universitas Sumatera Utara, Medan, Indonesia; Department of Child Health, Faculty of Medicine, Universitas Indonesia Jakarta, Indonesia
Lubis S.M., Department of Child Health, Faculty of Medicine, Universitas Sumatera Utara, Medan, Indonesia; Soesanti F., Department of Child Health, Faculty of Medicine, Universitas Indonesia Jakarta, Indonesia; Hidayati E.L., Department of Child Health, Faculty of Medicine, Universitas Indonesia Jakarta, Indonesia; Aap B.T., Department of Child Health, Faculty of Medicine, Universitas Indonesia Jakarta, Indonesia