Correlation between level of physical activity using IPAQ and exercise capacity using 6 min walk test in COPD patients. A cross sectional study. Int J of Biomed & Adv Res [Internet]. 2020 May 30 [cited 2026 May 3];11(5):e5425. Available from: https://www.ssjournals.co.in/index.php/ijbar/article/view/5425