Dong, Xiaoyu
Nao, Jianfei http://orcid.org/0000-0002-9668-7032
Article History
Received: 17 December 2018
Accepted: 8 March 2019
First Online: 19 March 2019
Compliance with ethical standards
:
: The authors alone are responsible for the content and writing of the paper.
: The authors declare that they have no conflict of interest.
: This study conformed to the Ethical Guidelines for Medical and Health Research Involving Human Subjects endorsed by the Chinese government.