DR. JAIMIN A MANSURIYA; DR. JIGNASA J MANSURIYA; 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, [S. l.], v. 32, n. 9, p. 1582–1590, 2025. DOI: 10.53555/sp8cyq47. Disponível em: https://jptcp.com/index.php/jptcp/article/view/12546. Acesso em: 13 dec. 2025.