Shanmuganathan A, G. A, N. M, R. R, Ganga N, K. P. Correlation of grade of pulmonary artery pressure with six minutes walk distance and dyspnoea grading in group 3 pulmonary artery hypertension. Int J Adv Med [Internet]. 2018 Mar. 21 [cited 2025 Dec. 24];5(2):343-50. Available from: https://www.ijmedicine.com/index.php/ijam/article/view/1028