Dr. Jaimin A Mansuriya, Dr. Jignasa J Mansuriya, and Dr. Alok Pritam. “RELATIONSHIP BETWEEN SEVERE VITAMIN D DEFICIENCY AND FREQUENCY OF COPD EXACERBATIONS: A RETROSPECTIVE COHORT STUDY AT A TERTIARY CARE CENTER IN NORTH INDIA”. Journal of Population Therapeutics and Clinical Pharmacology 32, no. 9 (October 3, 2025): 1582–1590. Accessed December 13, 2025. https://jptcp.com/index.php/jptcp/article/view/12546.