Abhishek Kumar, Ravi Shankar Mishra, and Piyush Khajuria. “Association Between Vitamin D Deficiency and Diminished Pulmonary Functions”. International Journal of Health and Clinical Research 4, no. 6 (April 1, 2021): 314–316. Accessed December 26, 2024. https://ijhcr.com/index.php/ijhcr/article/view/5080.