Sun, Shuping
Wang, Haibin
Article History
Received: 4 March 2018
Accepted: 16 August 2018
First Online: 20 September 2018
Compliance with ethical standards
:
: We declare that we have 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.
: Informed consent was obtained from all individual participants included in this study.