Received: 26 January 2021
Accepted: 6 July 2021
First Online: 28 July 2021
: The principles outlined in the Declaration of Helsinki and the Rules for Autopsy issued by the Ministry of Health of the People's Republic of China were followed. It had obtained the informed consent from donor or next of kin of the deceased and was approved by the Ethics Review Committee of Guizhou Medical University (Approval Number: 201801).
: Not applicable.
: The authors declare that there are no conflict of interest.