Received: 20 March 2021
Accepted: 3 June 2021
First Online: 10 June 2021
: This retrospective study was approved by the ethics committee of Guangdong Provincial People’s Hospital, Guangdong Academy of Medical Sciences, Guangzhou, China (No.GDREC2018322H(R2)). Written and informed consent was obtained from the patients included in this study.
: Not applicable.
: The authors declare that they have no competing interests.