Shaheen, S. . .; Humayun , A. .; Zaib, J. . . .; Bukhari , S. M. S. A. .; Jadoon, M. .; Sammar, K. . . The Correlation Between Cytokines Imbalance and Vitamin D Level in Patients With Early Chronic Obstructive Pulmonary Disease (COPD) and the Role of Vitamin D in Pulmonary Disease. Pak J Chest Med 2023, 29, 192-198.