Sensussiana T, Listyanawati MD, Rizqiea NS, Susilaningsih EZ. The relationship between smartphone usage duration and cognitive development in children aged 4-6 years. Media ilmu kesehatan [Internet]. 2026 Apr. 30 [cited 2026 Aug. 20];15(1):56-62. Available from: https://ejournal.unjaya.ac.id/index.php/mik/article/view/2019