Nair, Arun, and J Devika. “Prevalence of Vitamin D Deficiency in Adolescents With Recent Onset Poor Scholastic Performance”. Kerala Medical Journal 10, no. 4 (December 27, 2017): 152-155. Accessed December 22, 2024. https://www.keralamedicaljournal.com/index.php/KMJ/article/view/447.