Funding for this research was provided by:
Health and Family Planning Commission of Hunan Province, China (B2016027)
Article History
Received: 17 May 2020
Accepted: 13 August 2020
First Online: 19 August 2020
Compliance with ethical standards
:
: The authors declare that they have no conflicts of interest.
: This retrospective study was approved by the ethics committee of the Brain Hospital of Hunan Province.
: This retrospective study was approved by the ethics committee of Hunan Brain Hospital to waive the informed consent of the patients.
: All authors agree to be published
: Not applicable.