Nuraini, Nuraini (2023) The Effect of Gadget Usage Duration on Cognitive Function with MMSE in SMPN 2 Students in Koba District, Bangka Belitung Islands. The Effect of Gadget Usage Duration on Cognitive Function with MMSE in SMPN 2 Students in Koba District, Bangka Belitung Islands, 14 (04). ISSN 2808-4608