Funding for this research was provided by:
Sichuan Province Science and Technology Support Program (2018SZ0135, 2018SZ0255)
Received: 21 October 2019
Accepted: 30 March 2020
First Online: 8 April 2020
Ethics approval and consent to participate
: The institutional review board of West China Hospital approved this retrospective study.
: Written informed consent was obtained from all patients.
: The authors declare that they have no competing interests.