Sharma, Amit, Mamta Bhardwaj, Prerna Jain, and Devika Tayal. 2022. “Observational Study to Characterize Socio-Demographic Data and Clinical Presentation in Patients With Acute Exacerbation of Chronic Obstructive Pulmonary Disease”. International Journal of Research in Medical Sciences 10 (6):1349-53. https://doi.org/10.18203/2320-6012.ijrms20221493.