. 2021 Jul 8;18(14):7325. doi: 10.3390/ijerph18147325
© 2021 by the authors.
Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
Figure 2.
The working mechanism of the Yue Kang code.