Yang, Gang
Zhao, Gang
Zhang, Jian
Gao, Sichuan
Chen, Tingmei
Ding, Shijia
Zhu, Yun http://orcid.org/0000-0001-5289-6812
Article History
Received: 22 September 2018
Accepted: 13 February 2019
First Online: 20 February 2019
Compliance with ethical standards
:
: The authors declare 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 participants included in the study.