Hou, Guangdong
Zheng, Yu
Zhang, Lei
Lai, Dong
Wang, Fuli
Li, Xi’an
Yan, Fei
Tian, Jingyang
Zhang, Geng
Meng, Ping
Wei, Di
Zhu, Zheng
Yuan, Jiarui
Hui, Qiang
Yuan, Jianlin
Funding for this research was provided by:
the Natural Science Foundation Program of Shaanxi Province (2014JM4184, 2017JM8128)
Article History
Received: 25 May 2019
Accepted: 13 October 2019
First Online: 25 October 2019
Compliance with ethical standards
:
: There is no conflict of interest to disclose among all authors.
: All procedures performed in studies were in accordance with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards, and with the ethical standards of the institutional and national research committee.
: The SEER database is an open database and information of patients was anonymous in the SEER database, so the current study do not require patients’ consent.