. 2021 Nov 18;2021:7711056. doi: 10.1155/2021/7711056
Copyright © 2021 Zhichuang Lian et al.
This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Figure 2.
Underlying diseases in COVID-19 patients.