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Article History

Received: 30 October 2020

Accepted: 8 August 2021

First Online: 28 August 2021

Declarations

:

: The pigs used in this study were raised in a farm in Yantai area, China. We obtained written informed consent to use the animals in our study from the owner of the animals. Our study was approved by our institutional ethics committee in The Second Hospital of Shandong University.

: Not applicable.

: The authors declare that they have no competing interests.