DR NOOR-UL-ARFEEN; DR ALI ANWAR; DR USMAN AHMAD KAMAL; DR FAIZAN ALI KHAN; DR MUHAMMAD MUSSAB AMAN; DR AAIZ HASSAN. ASSOCIATION BETWEEN SERUM 25-HYDROXYVITAMIN D LEVELS AND FREQUENCY OF EXACERBATIONS IN CHRONIC OBSTRUCTIVE PULMONARY DISEASE PATIENTS. Journal of Population Therapeutics and Clinical Pharmacology, [S. l.], v. 32, n. 6, p. 1975–1978, 2025. DOI: 10.69980/89wah281. Disponível em: https://www.jptcp.com/index.php/jptcp/article/view/13421. Acesso em: 30 sep. 2026.