Funding for this research was provided by:
National Natural Science Foundation of China (81572649, 81702696)
Natural Science Foundation of Guangdong Province (2020A1515010176)
Natural Science Foundation of Guangdong Province (2018a030313572)
Dean's Fund of Nanfang Hospital, Southern Medical University (2019C019)
Received: 24 July 2020
Accepted: 18 May 2021
First Online: 29 May 2021
: Our study is a retrospective cohort study. However, due to the fact that a small number of patients in our follow-up came from various provinces in China, were far away or had died, and could not obtain the patients to sign the relevant consent, we consulted the ethics committee of our hospital, and the ethics will inform us, because there is no privacy and tissue samples or blood samples in this study, we can obtain the oral consent of the patient’s family members by phone and then query the relevant information in the case system for retrospective research. Ethical documents was approved by the Medical Ethics Committee of Nanfang Hospital (NFEC-2017-165).
: Not applicable.
: The authors declare that they have no competing interests.