Sikandar Ali Khan, Hina Hakim, Farzana Salman, Shamaila Wadud, Sara Yar Khan, Momina Haq. Effects of Vitamin D on Respiratory Function and Immune Status for Patients with Chronic Obstructive Pulmonary Disease (COPD): A Systematic Review. J Gandhara Med Dent Sci [Internet]. 2026 Jun. 30 [cited 2026 Sep. 24];13(3):132-4. Available from: http://jgmds.org.pk/index.php/JGMDS/article/view/890