Dr. Jaimin A Mansuriya, Dr. Jignasa J Mansuriya and Dr. Alok Pritam (2025) “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(9), pp. 1582–1590. doi:10.53555/sp8cyq47.