. 2021 Jun 16;16:1717–1740. doi: 10.2147/COPD.S305145
© 2021 Liu et al.
This work is published by Dove Medical Press Limited, and licensed under a Creative Commons Attribution License. The full terms of the License are available at http://creativecommons.org/licenses/by/4.0/. The license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Figure 3.
Patient’s needs to better access PR.