Ahmed, N., R. Parvin, and M. A. K. Azad. “Anemia in Patients With Chronic Obstructive Pulmonary Disease in a Tertiary Care Hospital in Bangladesh”. Journal of Enam Medical College, vol. 4, no. 3, Nov. 2014, pp. 151-5, doi:10.3329/jemc.v4i3.20943.