Ashraf, S., Ashraf, A., Ali, U., Hadi, N. ul, Anwar, R., Zaman, M. and Hafizullah, M. (2016) “FREQUENCY OF UNDIAGNOSED ISCHEMIC HEART DISEASE IN PATIENTS ADMITTED WITH ACUTE EXACERBATION OF CHRONIC OBSTRUCTIVE PULMONARY DISEASE”, Pakistan Heart Journal, 49(3). doi: 10.47144/phj.v49i3.1115.