Furqan Arief, Nizam Zikri Akbar, Andre Pasha Ketaren, Anggia Chairuddin Lubis, Hilfan Ade Putra Lubis & Harris Hasan. THE RELATIONSHIP OF NT PRO BNP AND ECHOCARDIOGRAPHIC FEATURES OF RIGHT VENTRICLE DISFUNCTION WITH CHRONIC OBSTRUCTIVE PULMONARY DISEASE AT HAJI ADAM MALIK GENERAL HOSPITAL MEDAN. IJRSM 2020, 7, 49-58.