Li, Danna
Tao, Yiwei
Cui, Minyi
Zhang, Wen
Zhang, Xiaolei
Hu, Xiaoli
Funding for this research was provided by:
National Natural Science Foundation of China (11772361, 81470731)
Article History
Received: 20 October 2018
Accepted: 14 February 2019
First Online: 22 February 2019
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 our institutional research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: For this type of study (retrospective study), formal consent is not required.