Lal R, Kumar P. A hospital based cross sectional study of clinical picture and spirometry pattern on interstitial lung diseases at a tertiary care centre. Int J Adv Med [Internet]. 2019 Jul. 24 [cited 2025 Dec. 25];6(4):1207-11. Available from: https://www.ijmedicine.com/index.php/ijam/article/view/1752