Putranto, R. et al. 2024. Effects of cholecalciferol supplementation on depressive symptoms, C-peptide, serotonin, and neurotrophin-3 in type 2 diabetes mellitus: A double-blind, randomized, placebo-controlled trial. Narra J. 4, 3 (Oct. 2024), e1342. DOI:https://doi.org/10.52225/narra.v4i3.1342.