“SERUM VITAMIN D3 LEVELS IN A CROSS SECTION OF POPULATION ATTENDING OPD AT TERTIARY CARE HOSPITAL IN DEHRADUN, UTTARAKHAND”. International Journal of Food and Nutritional Sciences, vol. 14, no. 2, Jan. 2025, pp. 1-9, https://www.ijfans.org/index.php/Journal/article/view/1331.