Khan, Amjad, Manzar Zakaria, Sikandar Khan, and Raheel Iftikhar. 2015. “CHANGES IN P-WAVE AMPLITUDE AND AXIS AFTER TREATMENT OF CHRONIC OBSTRUCTIVE PULMONARY DISEASE EXACERBATION: Changes in P-Wave Amplitude and Axis in COPD”. Pakistan Armed Forces Medical Journal 65 (1): 48-52. https://pafmj.org/PAFMJ/article/view/662.