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Sikandar Ali Khan, Hina Hakim, Farzana Salman, Shamaila Wadud, Sara Yar Khan and Momina Haq 2026. Effects of Vitamin D on Respiratory Function and Immune Status for Patients with Chronic Obstructive Pulmonary Disease (COPD): A Systematic Review. Journal of Gandhara Medical and Dental Science. 13, 3 (Jun. 2026), 132–142. DOI:https://doi.org/10.37762/jgmds.13-3.890.