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Authors
Shan, Qinge
Shi, Jianxiang
Wang, Xiaohui
Guo, Jun
Han, Xiao
Wang, Zhehai
Wang, Haiyong http://orcid.org/0000-0003-3168-5121
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Funding
Funding for this research was provided by:
Special Funds for Taishan Scholars Project (tsqn201812149)
Academic promotion program of Shandong First Medical University (2019RC004)
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Article History
Received: 19 August 2020
Accepted: 20 May 2021
First Online: 29 May 2021
Declarations
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: Because the data extracted from the SEER database in this study did not contain personally identifiable information, informed consent and ethical proof were not required.
: Not applicable.
: The authors declare that they have no competing interests.
