Jatav, V. S.; Meena, S. R.; Jelia, S.; Jain, P.; Ajmera, D.; Agarwal, V.; Dayma, C. L.; Arif, M. Electrocardiographic Characteristics of Patients With Chronic Obstructive Pulmonary Disease and Its Correlation With Disease Severity. Int J Adv Med 2017, 4, 514-518.