Zhang, Yan
Li, Baohong http://orcid.org/0000-0002-4631-4035
Article History
Received: 17 November 2019
Accepted: 14 December 2019
First Online: 3 January 2020
Compliance with ethical standards
:
: The authors declare that they 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. And this study was approved by the Ethics Committee of Zhangye People’s Hospital Affiliated to Hexi University.
: Informed consent was obtained from all individual participants included in the study.