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Authors
Xie, Guilan
Wang, Ruiqi
Shang, Li
Qi, Cuifang
Yang, Liren
Huang, Liyan
Yang, Wenfang http://orcid.org/0000-0001-7799-5008
Chung, Mei Chun
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Funding
Funding for this research was provided by:
Key Research and Development Program of Shaanxi (2019SF-100)
The Bureau of Xi’an Science and Technology (201805098YX6SF32(1))
The Clinical Research Project of the First Affiliated Hospital of Xi’an Jiaotong University (XJTU1AF-CRF-2019-023)
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Article History
Received: 13 May 2020
Accepted: 26 August 2020
First Online: 1 September 2020
Ethics approval and consent to participate
: SEER database is freely available online in public for academic or clinical purposes, and all data obtained from the SEER database are de-identified. In addition, all authors have signed the data-use agreement for the SEER database before accessing the raw data from the SEER database. And we followed the agreement through the whole study in order to protect the privacy of patients. Therefore, ethics approval and consent to participate are not needed in this study.
: Not applicable.
: The authors declare that they have no competing interests.
