Mi, Dong http://orcid.org/0000-0001-5511-1179
Zhang, Yuexiang
Article History
Received: 5 April 2019
Accepted: 15 October 2019
First Online: 8 February 2020
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 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.