Sun, Hui-Hui
Hong, Xin
Liu, Bing
Cui, Jia-Qu
Zhou, Zhao-Ming
Xie, Xin-Hui
Wu, Xiao-Tao http://orcid.org/0000-0001-7937-626X
Funding for this research was provided by:
National Natural Science Foundation of China (81572109, 81572190)
Article History
Received: 2 July 2017
Revised: 4 January 2018
Accepted: 13 March 2018
First Online: 7 May 2018
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: We signed the Data-Use Agreement for the SEER 1973–2013 Research Data File and had permission to use the database for research.