Sharma, A., Bhardwaj, M., Jain, P. and Tayal, D. (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), pp. 1349–1353. doi: 10.18203/2320-6012.ijrms20221493.