Bibi Sarah Pandhiani, Riaz Hussain Shah, Khalil Ahmed Sanghro, Bakht Ali Siyal, Gordhan, Aijaz Ahmed Laghari. “Levels of Serum Vitamin D Among Patients of Chronic Obstructive Pulmonary Disease and Its Association With Severity: A Case Control Study”. Annals of the Romanian Society for Cell Biology, vol. 25, no. 7, Dec. 2021, pp. 1837-45, https://annalsofrscb.ro/index.php/journal/article/view/10654.