Liu, Ya
He, Xiaocui
Chen, Yuli
Cao, Dan
Article History
Received: 4 July 2019
Accepted: 25 October 2019
First Online: 5 November 2019
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: The study protocol was approved by the Ethics Committee of Heze Municipal Hospital. 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.
: All participants in this study were informed and gave a written consent.