Received: 28 December 2020
Accepted: 22 April 2021
First Online: 24 May 2021
: The study was authorized by the Ethics Committee of Zhengzhou Anorectal Hospitaland was carried out according to the guidelines of Declaration of Helsinki.The animal experimentwas approved by the Animal Care and Use Committee of Zhengzhou Anorectal Hospital and performed following the instructions of the national animalprotection and ethics institute.
: Not applicable.
: The authors report no conflicts of interest in this work.