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Saima Shaheen, Maria Sarfraz, Anum Saeedullah, Nadia Qazi, Tahira Jehangir, Sara Mariyum. Role of Supplementation of Vitamin C and D in their Low Serum Values in Critically Ill COPD Patients of Tertiary Care Hospital. Pak J Chest Med [Internet]. 2022Mar.2 [cited 2025Dec.15];28(1):46-53. Available from: https://www.pjcm.net/index.php/pjcm/article/view/851