Figure 4

The schematic diagram of the four partitions in the experimental ward. The closed experimental environment contains Parts I, II, and III. (The figure was generated by PowerPoint 2019, URL: https://www.microsoftstore.com.cn/software/office).

The schematic diagram of the four partitions in the experimental ward. The closed experimental environment contains Parts I, II, and III. (The figure was generated by PowerPoint 2019, URL: https://www.microsoftstore.com.cn/software/office).