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Authors
Huang, Zhangheng
Hu, Chuan
Liu, Kewen
Yuan, Luolin
Li, Yinglun
Zhao, Chengliang
Hu, Chanchan
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Article History
Received: 12 March 2020
Accepted: 13 November 2020
First Online: 25 November 2020
Ethics approval and consent to participate
: We received permission to access the research data file in the SEER program from the National Cancer Institute, US (reference number 15260-Nov2018). Approval was waived by the local ethics committee, as SEER data is publicly available and de-identified.
: Not applicable.
: The authors declare that they have no competing interests.
