Zhang, Zhaotian
Zhang, Shaochong
Article History
Received: 9 April 2018
Accepted: 16 June 2018
First Online: 22 June 2018
Compliance with ethical standards
:
: All the authors declare there are no competing financial interests in relation to the current study.
: All procedures performed in the 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.