Ye, Guogang
Xu, Ting
Liu, Jiangbin
Xu, Weijue
Lv, Zhibao
Article History
Accepted: 13 October 2019
First Online: 7 November 2019
Compliance with ethical standards
:
: The authors declare 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.
: For this type of study, formal consent is not required.