Madas, S. and Vittal, D.S. 2017. Estimation of measured pulmonary artery to aorta ratio for prognosis of pulmonary hypertension in chronic obstructive pulmonary disease patients. International Journal of Advances in Medicine. 3, 2 (Jan. 2017), 200–205. DOI:https://doi.org/10.18203/2349-3933.ijam20160973.