Article History
Received: 7 July 2021
Revised: 8 October 2021
Accepted: 12 October 2021
First Online: 8 December 2021
Ethical approval
: The current study was approved by the Ethics Committees of Hunan Provincial People’s Hospital (The First Affiliated Hospital of Hunan Normal University) and Hunan Provincial Maternal and Child Healthcare Hospital and performed in accordance with the <i>Declaration of Helsinki</i>. Written informed consents were obtained from all participants before enrollment. Animal experiments were approved by the Animal Ethics Committees of Hunan Provincial People’s Hospital (The First Affiliated Hospital of Hunan Normal University) and Hunan Provincial Maternal and Child Healthcare Hospital and performed in accordance with <i>Guide for the Care and Use of Laboratory Animals</i> published by the US National Institutes of Health. Extensive efforts were made to minimize the suffering of the included animals.
: Not applicable.
: The authors declare no competing interests.