Barua, U. K.; Ghosh, D. K.; Biswas, A.; Nath, M.; Biswas, B. K.; Saha, N. R.; Ruble, M. K. Depression and Its Risk Factors Among Patients With Chronic Obstructive Pulmonary Disease (COPD) in a Tertiary Level Hospital. J Shaheed Suhrawardy Med Coll 2017, 7, 44-48.