R. PK, Ratnam PK, R. PKK, K. KKTV. Clinical profile of patients with chronic obstructive pulmonary disease at a tertiary care hospital. Int J Adv Med [Internet]. 2020 Feb. 24 [cited 2025 Nov. 27];7(3):426-30. Available from: https://www.ijmedicine.com/index.php/ijam/article/view/2143