Received: 30 December 2020
Accepted: 17 December 2021
First Online: 6 January 2022
: We obtained ethical approval for this study from the Medical and Health Research Ethics Committee in The Second People’s Hospital of Chengdu, Affiliated Traditional Chinese Medical Hospital of Southwest Medical University of Sichuan Province, and Nuclear Industry 416 Hospital of Chengdu. All three research centers allow us to access and use these medical records. The current study was carried out according to the Declaration of Helsinki. All the pertinent guidelines required by our institution for the preparation of retrospective studies have been followed. The data used in this study was anonymized before its use.
: Not applicable.
: The authors declare that they have no competing interests.