Inam, Asma, Nazish Sadiq, Summyah Niazi, Rakhshanda Naheed, Amber Asfandyar, and Fouzia Qadir. 2021. “The Physiologic and Biochemical Effects of Vitamin C in Patients With Chronic Obstructive Pulmonary Disease: A Systematic Review”. Pakistan Journal of Chest Medicine 27 (4):364-72. https://www.pjcm.net/index.php/pjcm/article/view/605.