Yuan, C.
Wang, Q. http://orcid.org/0000-0002-7687-6741
Article History
Received: 7 November 2017
Accepted: 23 February 2018
First Online: 13 March 2018
Compliance with ethical standards
:
: All authors have stated that they have no conflicts 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.
: Informed consent was obtained from all individual participants included in the study.