Cardiorespiratory clinical response in the 6 minute walk test with double mask in smoking and non-smoking male between 40 and 60 years old. Bol méd postgrado [Internet]. 2022 Apr. 8 [cited 2026 Aug. 8];37(2):9-14. Available from: https://revistas.uclave.org/index.php/bmp/article/view/3792