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Authors
Guo, Leqian
Xie, Guilan
Wang, Ruiqi
Yang, Liren
Sun, Landi
Xu, Mengmeng
Yang, Wenfang
Chung, Mei Chun
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Article History
Received: 17 March 2021
Accepted: 31 May 2021
First Online: 19 June 2021
Declarations
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: The data in the SEER database do not require informed patient consent because this database is publicly available and all authors have signed the data-use agreement for the SEER database before accessing the raw data from the SEER database.
: Not applicable.
: The authors declare that they have no competing interests.
