Funding for this research was provided by:
Department of Science and Technology of Sichuan Province (2018SZ0224)
Received: 16 April 2020
Accepted: 12 May 2020
First Online: 26 May 2020
Ethics approval and consent to participate
: This study was only a retrospective report, so there were no patients or other participants.
: Not applicable.
: The authors declare that they have no competing interests.