Pant, Pankaj, Shovit Thapa, Santa K Das, and Niraj Bam. “Serum Vitamin D Level in Chronic Obstructive Pulmonary Disease and Its Relation With Severity: A Single Centre Study”. Journal of Institute of Medicine Nepal 41, no. 2 (December 4, 2019): 56–58. Accessed December 22, 2024. https://nepjol.info/index.php/JIOM/article/view/26552.