1.
A. VK, K. SS, Reddy S. Importance of spirometry, pulse oximetry and hematocrit in chronic obstructive pulmonary disease. Int J Adv Med [Internet]. 2019 May 24 [cited 2025 Oct. 12];6(3):917-21. Available from: https://www.ijmedicine.com/index.php/ijam/article/view/1713