Putranto, Rudi, et al. “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, vol. 4, no. 3, Oct. 2024, p. e1342, doi:10.52225/narra.v4i3.1342.