Ma, Jian-Xun
Xia, You-Chen
Li, Bi
Zhao, Hong-Mei
Lei, Yu-Tao
Article History
Received: 16 June 2019
Accepted: 26 September 2019
First Online: 9 October 2019
Compliance with Ethical Standards
:
: The authors declare that they have no conflict of interest.
: All procedures performed in this study involving human participants were in accordance with the ethical standards of the participating institutions and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.
: For this retrospective study, formal consent is not required.