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Authors
Han, Dong
Gao, Fei
Liu, Jin Long
Wang, Hao
Fu, Qi
Yang, Guo Wang
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Article History
Received: 13 December 2020
Accepted: 4 May 2021
First Online: 17 May 2021
Declarations
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: We signed the ‘Surveillance, Epidemiology, and End Results Program Data Use Agreement’ in accordance with the requirement of using SEER database. Therefore, we were permitted to obtain and download data from the SEER database. This study was approved by the ethics committee of Beijing Hospital of Traditional Chinese Medicine, Capital Medical University.
: No individual person’s data was applicable in this manuscript.
: The authors have declared no conflicts of interest.
