Funding for this research was provided by:
Shanghai Science and Technology Commission Research Project (17411953200)
Ningxia Key Research and Development Program (2019BEG03018)
Article History
Received: 12 November 2020
Accepted: 1 January 2021
First Online: 15 January 2021
Compliance with ethical standards
:
: Authors declare that they have no conflict of interest.
: For this type of retrospective study, formal consent is not required.
: For this type of retrospective study, formal consent is not required.
: This is a retrospective study. The Shanghai General Hospital Research Ethics Committee has confirmed that no ethical approval is required.