Hatem, Nour, Rohadi Rosyidi, Mohamed Sami, Sana Tariq, and Putri Wulandari. “A Cross-Sectional Study on Vitamin D Deficiency As a Risk Factor for Depression in the Elderly”. Avicenna Journal of Health Sciences 1, no. 4 (December 31, 2024). Accessed October 28, 2025. https://www.avicennajhs.com/index.php/ajhs/article/view/50.