Bibi Sarah Pandhiani, Riaz Hussain Shah, Khalil Ahmed Sanghro, Bakht Ali Siyal, Gordhan, Aijaz Ahmed Laghari 2021. 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. 25, 7 (Dec. 2021), 1837–1845.