The Role of Pedometer Based Walking Exercise To Quadriceps Muscle, Quality of Life, Benefit, and Cost in Stable COPD Patient. J Respirol Indones [Internet]. 2020 Jul. 31 [cited 2025 Jul. 16];40(3):163-72. Available from: http://www.jurnalrespirologi.org/index.php/jri/article/view/117