Liu, Hongyuan
Fang, Xiang
Yu, Zeping
Lang, Yun
Xiong, Yan
Duan, Hong http://orcid.org/0000-0001-9430-5937
Article History
Received: 7 October 2017
Accepted: 26 March 2018
First Online: 17 April 2018
Compliance with ethical standards
:
: All procedures in studies involving human participants were performed in accordance with the ethical standards of the institutional and national research community and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: The authors declare that they have no conflict of interest.