Xu, Y.
Xu, G.
Wang, X.
Mao, M.
Wu, H.
Baklaushev, V. P.
Chekhonin, V. P.
Peltzer, K.
Wang, G.
Zhang, C. http://orcid.org/0000-0001-7096-8488
Funding for this research was provided by:
Natural Science Foundation of China (81702161)
Natural Science Foundation of China (81802508)
Natural Science Foundation of China (81903398)
Article History
Received: 23 April 2020
Accepted: 10 June 2020
First Online: 30 June 2020
Compliance with ethical standards
:
: The authors declare that they have no competing interests.
: The SEER database is an open database. Data released from the SEER database do not require informed patient consent, because cancer is a reportable disease in every state of the United States. The present study complied with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.
: For this type of study formal consent is not required.